55 results about "Hair breakage" patented technology

A necklace cover, or sleeve, which covers jewelry that is worn around the neck is described. The necklace cover is designed to be worn at the back of a neck and is worn over a piece of jewelry to prevent tangling of hair, hair breakage, and / or damage to a persons clothing (e.g. snags or pulls) that often occurs when a person wears jewelry around the neck. Methods for preventing a wearer's hair from getting tangled in a jewelry composition worn around the neck of a wearer are also provided. The methods comprise providing the necklace covers according to the invention.

An improved hair retention system for more securely retaining hair while reducing breakage. A barrette is adhesively secured along one surface to a soft flexible material. The material is also secured to the opposite side of the head and the exterior bodies of the barrette. The interior body of the barrette is not secured on either side to the resilient material. In operation, when the interior body is biased against the exterior bodies of the barrette, instead of metal contacting metal, the metal of the interior body contacts the resilient material, thereby reducing the potential for hair breakage. By providing the material with a nap, the hair system secures the hair more tightly as well. Other accessories, such as bows, gems, monograms, logos and the like may be secured to the back of the improved hair retention system.

Provided is a hair cleansing composition containing (A) an amphipathic amide lipid, (B) an anionic surfactant and (C) a silicone. The hair cleansing composition of the present invention has advantages such as protecting hair from physical or chemical stimulation and preventing split ends or hair breakage~without impairing its cleansing ability and,feeling upon use, and moreover, gives to hair after shampooing a pleasant feeling to the touch and moisture retention properties such as natural smoothness, moist feeling, and suppleness which healthy hair inherently possesses, and has excellent stability.

The invention provides a fresh and cool oil-control silicon oil-free hair shampoo which is composed of lauroyl collagen amino acid, sodium cocoamphoacetate, cocamidopropyl betaine, decyl glucoside, glyceryl laurate, peg-120 methyl glucose dioleate, stearamide propyl dimethyl ammonium, guar gum hydroxypropyl trimethyl ammonium chloride, polyquaternary ammonium salt-10, peg-7 glyceryl cocoate, hydroxyethylurea, capryloyl glycine, citric acid, allantoin, triethanolamine, hydrolysis avenin, hydrolyzed collagen, ginger root oil, palmitamidopropylamine trimethyl ammonium chloride, hexamidine di(ethylenhydrin-sulfonic acid) salt and a matrix. The invention further discloses a making method of the hair shampoo. The hair shampoo is capable of adjusting hair environments, enabling hair to be at a silicon oil free of small silicon oil deposition state, controlling oil, removing dandruff, making hair fresh and cool, nutrificating scalp and hair, repairing damaged hair, preventing hair dry yellow,hair spitting or hair breakage, and making the hair soft and glary.

The present invention teaches all-natural formulations comprising amino acids for hair application. These formulations can be used for a wide range of hair treatments including hair detangling, hair curl loosening, hair straightening, for preventing hair breakage and stimulating hair growth. The methods used to generate the formulations are disclosed, along with the methods for treating hair with the formulations to attain one or more desired benefits.

The invention relates to a necklace cover, or sleeve, which covers jewelry that is worn around the neck. The necklace cover is designed to be worn at the back of a neck and is worn over a piece of jewelry to prevent tangling of hair, hair breakage, and / or damage to a persons clothing (e.g. snags or pulls) that often occurs when a person wears jewelry around the neck. Methods for preventing a wearer's hair from getting tangled in a jewelry composition worn around the neck of a wearer are also provided.

This improved version of the Hard Hat Cushioning Device is more universal and can be used with virtually any hard hat, construction hat, bump cap, and similar hats designed for protection. The device allows the hat to fit more comfortably and securely and helps to prevent hair breakage while maintaining its decorative style. The cushioning effect reduces the restriction of blood flow to the scalp.The newly added air vents, and specific cotton outer material and inside batting material, improves air flow and circulation, making the hat more comfortable to wear while allowing warm air and perspiration to escape. These new improvements increase the ability of the cushioning device to act as a sweat band. Allowing air flow from inside the hat to the outside allowing for decreased temperature of the overall hat itself.

The invention discloses an anti-hair loss traditional Chinese medicine composition and a preparation method and application thereof. The anti-hair loss traditional Chinese medicine composition comprises the following raw materials (by weight): 8-17 parts of fleece-flower root, 6-14 parts of ginger, 5-12 parts of black sesame, 5-12 parts of humulus lupulus, 4-13 parts of gotu kola, 3-8 parts of Chinese angelica, 2-6 parts of ginseng, 3-8 parts of Sophora flavescens, 2-7 parts of pseudo-ginseng, 4-8 parts of achyranthes root, 2-6 parts of saposhnicovia divaricata, 3-7 parts of Rhizoma Drynariae,3-7 parts of Chinese gentian, 5-15 parts of mint essential oil and 3-8 parts of rosemary essential oil. By the preparation method and through cooperative interaction of the raw materials, the anti-hair loss traditional Chinese medicine composition supplements nutrients required by the head skin, promotes blood circulation of the head, enhances metabolism of scalp, activates hair follicle, promotes hair growth to make hair to be thick, regulates oil balance of scalp, refreshes and soothes scalp, and can effectively treat alopecia, hair breakage and less hair.

The present invention is a multipurpose infant and toddler hair and scalp protection pad, or baby hairapy (hair therapy) pad, including a thin, firm interior padding and an exterior hair and scalp protection fabric. The baby hairapy pad is a stain-resistant, satin-covered foam and cotton / polyester pad designed to minimize hair breakage, loss, and tangling, help maintain scalp moisture balance, and protect hairstyles in infants and toddlers. Unlike pillows and linens with satin cases or aromatherapy pillows, its foam and cotton / polyester interior is both thin and firm to be safe for infants. Further, it is small and flexible enough to be easily transported and used in multiple areas: cribs, beds, carriers, floors, strollers, etc. Plus, it provides for the options to include the soothing, calming scents of chamomile and lavender within it and to use it as a nursing pad for breastfeeding mothers and their babies.

The invention relates to a purely natural plant hair dye and a preparation method thereof, and belongs to the technical field of daily chemical products. The method comprises the following steps: grinding walnut green seedcases, and extracting for 2-4 times with an ethanol aqueous solution having a volume percentage of 50-80 percent; concentrating an extracting solution by rotary evaporation, and reclaiming solvent to obtain extract; adding virgin tea oil which is 9.9-10.1 percent of the mass of the extract into the extract, and adding vitamin B5 which is 1.9-2.1 percent of the mass of the extract; and homogenizing by adopting a high-pressure homogenizer, and sterilizing to obtain the purely natural plant hair dye. The hair dye does not contain chemical preparation, has an excellent hair dyeing effect, can be used for maintaining glossy hair for a long time, promoting scalp blood circulation and metabolism, preventing hair breakage and hair loss and effectively protecting hair, and is easy to popularize and apply.

Provided is a hair cleansing composition containing (A) an amphipathic amide lipid, (B) an anionic surfactant and (C) a silicone. The hair cleansing composition of the present invention has advantages such as protecting hair from physical or chemical stimulation and preventing split ends or hair breakage without impairing its cleansing ability and feeling upon use, and moreover, gives to hair after shampooing a pleasant feeling to the touch and moisture retention properties such as natural smoothness, moist feeling, and suppleness which healthy hair inherently possesses, and has excellent stability.

The invention relates to an itch rubbing pile for cow. The itch rubbing pile comprises an upright column (1), a fixed ring (6), a sleeve (3) and a top cover. Nipple-shaped bulges (2) made of metallic materials are distributed on the outer side of the sleeve (3) and are installed on the sleeve holes from inside to outside. The base part and the middle part of the sleeve are cylinders, and the diameter of the middle cylinder arranged outside of the sleeve (3) is 20+2mm, and the length is 25+2mm. The end parts of the nipple-shaped bulges (2) are two superimposed cones. The knuckle cone angle and the point angle are 150+15 degrees. The interval of the nipple-shaped bulges (2) on the sleeve (3) is 10-15mm. The invention solves the problems of enwinding of cow hairs by the conventional cow body brush products, incapability of scraping off dirt on the cow body, unobvious effect on itch relieving, high possibility of brush hair breakage, scratching of the skin of the cow body by fractures and the like, and the effect of practice on pastures is relatively ideal. the sleeve (3) is sleeved outside the upright column (1) during installation, the fixed ring (6) is sleeved, and the top cover (5) is covered, and then the upright column is fixed through screws (4)

The invention discloses a no-wash protein nourishing hair lotion and a preparation method thereof, and belongs to a hair lotion. The hair lotion comprises the following components in parts by mass: 5-10 parts of a water-soluble humectant, 0.5-2 parts of a thickening agent, 0.5-2 parts of a neutralizing agent, 0.5-2 parts of a protein conditioner, 0.5-3 parts of an emulsifying agent, 2-5 parts of vegetable fat, 1-3 parts of a cationic polymer conditioner, 0.2-0.5 part of panthenol, 2-5 parts of ethanol, 0.5-5 parts of a plant extract, 2-5 parts of a silicone oil hair conditioning agent, 0.2-0.8part of a flavoring agent and 50-80 parts of deionized water. The protein and the cation selected by the hair lotion have relatively good hair adsorbability and good water replenishing and moisturizing properties, so that the hair can be soft, smooth and glossy, and hair splitting and hair breakage are reduced. Meanwhile, the hair lotion has the characteristics of no toxicity, no irritation, no allergy, safety, environmental friendliness, no wash, convenience in use and the like, and is easy to produce and popularize.

The invention provides a hair generating, blackening, moistening and protecting shampoo and a making method thereof. The hair generating, blackening, moistening and protecting shampoo is made of the following components in parts by mass: 40-60 parts of oriental arborvitae, 90-110 parts of radix polygoni multiflori, 90-110 parts of pseudo-ginseng, 40-60 parts of cordyceps sinensis, 40-60 parts of rehmannia glutinosa, 40-60 parts of codonopsis pilosula, 40-60 parts of salvia miltiorrhiza, 40-60 parts of carthamus tinctorius, 90-110 parts of galingale, 90-110 parts of mint, 4-6 parts of mulberry leaves, 4-6 parts of radix bupleuri, 40-60 parts of bamboo leaves, 40-60 parts of prunella vulgaris, 100 parts of semen cassiae, 90-110 parts of angelica tuhuo, 40-60 parts of rhizoma homalomenae, 40-60 parts of mulberry twigs, 40-60 parts of atractylodes macrocephala, 90-110 parts of psoralea corylifolia, 40-60 parts of pine nut kernels, 90-110 parts of polygala tenuifolia, 90-110 parts of semen vaccariae, 40-60 parts of herba lycopi, 90-110 parts of drynaria rhizome, 90-110 parts of corydalis tuber, 40-60 parts of common turmeric and 40-60 parts of cortex fraxini. The hair generating, blackening, moistening and protecting shampoo is applicable to different types of hair such as baldhead, alopecia universalis, alopecia areata, hair loss, hair breakage, grease spill hair and common hair maintenance and caring, has the effects of hair generation, blackening, moistening and protection, can both prevent and treat hair problems, and is free of toxic and side effects, convenient to use, low in price and simple in making process.

The invention discloses dandruff removal and itching stopping shampoo, which is prepared from the following raw materials in part by weight: tuber fleeceflower root extract, seabuckthorn oil, mint oil, cantharidin tincture, vitamin B5, lauryl sodium sulfate, coconut oil fatty acid diethanol amide, preservative, essence and the balance of deionized water. The dandruff removal and itching stopping shampoo has exquisite and smooth tactile sensation and fragrant smell, can expand the blood capillaries of the head, increase the nutrition of the hair and improve the toughness of the hair, has positive protection effect on the damaged hair, and obviously reduces the nursing and washing frequency; baldness and hair breakage are obviously reduced; particularly, the duration of the black, bright, flexible and smooth effect of the nursed hair is obviously prolonged; and the shampoo has the effects of removing redundant fat and clearing the blocked hair follicles, has good effects of preventing baldness and blackening the hair, and does not stimulate the scalp.

The invention discloses a writing brush cleaning device for protecting pen hair and a writing brush cleaning method. The writing brush cleaning device comprises a cleaning box, a box cover and a drying chamber, wherein the box cover is detachably arranged on the cleaning box, and the drying chamber is arranged below the box cover; the drying chamber and the box cover are integrally formed, and a pen socket penetrating through the box cover and the drying chamber is formed in the box cover; a writing brush clamp used for clamping a writing brush is arranged at the top of the box cover; heatingwires are arranged on the inner wall of the drying chamber, the top of the drying chamber is provided with a fan which blows downwards; the bottom and the side wall of the box cover are provided withultrasonic generators respectively; the box cover is provided with cleaning liquid, and the ultrasonic generators are located below the liquid level of the cleaning liquid. According to the writing brush cleaning device, the phenomena of brush hair breakage or dehairing caused by violent cleaning of strong vibration can be avoided. The drying time is shortened, the dried pen hair can be attached to the writing brush, and the pen hair of the writing brush can be well protected.

The invention belongs to the technical field of preparation of plant extracts, and in particular relates to a tea bran extract, which contains 75-88% of tea saponin and 10-20% of tea oil by weight. The specific preparation method is: taking tea Bran pulverization, high-pressure microjet superfine pulverization treatment, microwave extraction, eluting through macroporous resin chromatography column, ethanol solution, collecting eluate, concentrating and drying to obtain the desired tea bran extract. The tea bran extract prepared by the method of the present invention will not cause hard hair, brittle hair, hair loss and other problems after long-term use, and is also suitable for people with dry hair without causing dry hair.

A hair measuring assembly capable of being operated by a single hand of a user and including a collection assembly, including a hair retaining and measuring portion movably mounted on a body and selectively disposable between a collecting position and a retaining and measuring position. The single handed manipulation of a hand grip, concurrently disposes a plurality of two grip segments into either an open or a closed orientation, thereby forcing the hair retaining and measuring portion between the collecting and hair retaining and measuring positions. A “single use” cartridge for carrying out the collection, retention and measurement of hair and also hair breakage is presented. The “single use” cartridge includes suitable structure for mounting and operable attachment to the hair measuring assembly by a person, without regard to whether he or she is left-handed or right-handed.

The invention discloses a constant rotation strong-magnetic comb. The constant rotation strong-magnetic comb comprises a comb frame (1) and comb teeth blocks (2), wherein the comb teeth blocks (2) are detachably connected to the comb frame (1), and a rotation strong-magnetic device is arranged on the back of the comb frame (1). According to the constant rotation strong-magnetic comb, through the combined use of an arc-shaped magnet and a direct-current motor, the comb teeth can vibrate, meanwhile, the rotating magnet can generate a magnetic field, so that a constant gyromagnetic function is provided, and the effects of promoting the head blood circulation and the human cell microcirculation are achieved; the rubber soft comb-plate comb teeth have the effect of regulating the acting force, so that the head feels comfortable. The constant rotation strong-magnetic comb is particularly suitable for combing the hair easily having the entanglement and knotting phenomenon, so that the pain and hair breakage caused by pulling can be reduced, the combing injuries are avoided, and the generation of static electricity is prevented.

The invention discloses a silicone oil free repairing liquid shampoo. In the formula of the liquid shampoo, a liquid shampoo composition with the mass percentage content of 0.75-17.5 percent, the liquid shampoo composition comprises the following components in parts by mass: 0.05-2 parts of a rehmannia glutinosa extract, 0.1-2 parts of an extract of piper nigrum fruits, 0.1-1 part of a rice extract, and 0.1-1 part of a cacumen biotae extract. The silicone oil free repairing liquid shampoo provided by the invention solves the problem that after a long term use of liquid shampoo containing silicone oil and other hazardous substances, hair follicle blocking can be caused, and scalp breathing can be obstructed, and consequently, impacts on scalp and hair health, alopecia, hair loss and hair breakage can be caused.

The invention discloses shampoo and a preparation method thereof. The shampoo is prepared from the following components by mass percent: 0.50-1.0% of sunflower seed oil, 0.05-0.10% of span-40, 2-6% of Fuzhuan tea extract, 1.0-3.0% of glycol distearate, 0.5-2.0% of octadecanol, 1.0-5.0% of cocamidopropyl betaine, 0.3-0.7% of guar gum hydroxypropyl trimethyl ammonium chloride, 0.3-0.7% of cationic hydroxyethyl cellulose, 10-20% of lauryl alcohol ether ammonium sulfate, 2-6% of sodium chloride, 0.10-0.20% of ethylene diamine tetraacetic acid disodium, 0.10-0.20% of isothiazolinone, 0.0010-0.0030% of a flavoring agent and the balance of deionized water, wherein the sum of the mass percents of the components is equal to 100%. The shampoo provided by the invention has the functions of cleaning, removing dandruff, repairing keratin and preventing alopecia and hair breakage.

A process for inhibiting hair breakage and protecting hair from UV light involving contacting hair with a composition containing: (a) a natural oil comprising: (i) from about 0.01 to 5% by weight of a tocopherol; (ii) from about 0.01 to 10% by weight of a sterol; and (iii) optionally, from about 0.001 to 2% by weight of a carotinoid; and (b) up to about 10% by weight of an esterquat.

The invention discloses a natural plant multiple-effect hair growing and conditioning agent and belongs to the technical field of production and preparation of nano natural plant extract cosmetics for hair. The natural plant multiple-effect hair growing and conditioning agent consists of a pine needle proanthocyanidines hair beautifying and growing anti-hair-loss anti-bald hair conditioning agent, a natural plant cacumen biotae hair growing agent, a ginseng rapid hair growing anti-hair loss agent, a pine needle beta-carotene black hair growing and blackening agent, a pine needle amino acid hair growing and blackening anti-hair loss agent, a tea pigment rapid hair growing anti-hair loss hair conditioning agent and a natural plant blacking and brightening hair growing agent coated on eyebrows. Active factor components subjected to nanocrystallization of natural plants are utilized to go deep into hair follicle roots, enough nutrition is provided, scalp capillary microcirculation is promoted, tissue regeneration hair root melanin is generated to regenerate hair, and symptoms such as hair loss, hair breakage and balding, alopecia areata, hair furcation and dryness, head itching and scurf are effectively avoided, so that white hair is blackened, and the hair is black and glossy. The hair conditioning agent is a pure natural plant multiple-effect hair growing and conditioning agent.

A personal care composition which exhibits excellent cleaning qualities without the use, or inclusion, of a sulfated surfactant. Generally, the personal care compositions described herein contain from about 0.01 wt % to about 0.05 wt % of aloe. The aloe vera can contain salts, which can further increase aloe vera potentiation, making the aloe vera more available to deliver consumer desired benefits such as increased hair strength as demonstrated by a decrease in hair breakage during washing. The aloe vera can contain from about 100 mg / 100 g (of aloe) to about 300 mg / 100 g (of aloe) of a material selected from the group consisting of sodium salt, potassium salt, calcium salt, zinc salt, magnesium salt, copper salt and mixtures thereof. Additionally, the personal care compositions described herein contain a cationic cellulose polymer. The cationic cellulose polymer can have a weight average molecular weight of from about 1 Million to about 2.2 Million, and from about 1.8 Million to about 2 Million; and a charge density of from about 0.4 to about 2.6, from about 0.4 to about 2, and from about 0.6 to about 1.6.

The invention relates to the technical field of wig making, in particular to a manufacturing technology of an anti-dropping soft wig. According to the manufacturing technology, hair is soaked in an aqueous solution of sulfuric acid and sodium hypochlorite so that the hair can be sterilized; sodium tripolyphosphate and sodium dodecyl benzene sulfonate in the mixed component are matched with each other, and then under the action of ultrasonic dispersion, the sodium tripolyphosphate and the sodium dodecyl benzene sulfonate are uniformly dispersed into an ammonia water solution. The hair cleaningeffect can be greatly improved, so that the surface of the hair is clean, and the friction force of the hair is obviously reduced. Hair cuticle falling from the hair is completely scraped through a comb; in the scraping process, the phenomenon of hair breakage can be remarkably reduced due to small friction force, so that the flexibility of the manufactured wig is good; furthermore, the hair adheres to the surface of an artificial skin layer through an adhesive so that the hair can firmly adhere to the surface of the artificial skin layer, and the hair loss phenomenon is reduced.

The invention discloses a silicone-oil-free shampoo. The silicone-oil-free shampoo comprises 5 to 12 parts of a primary surfactant, 2 to 9 parts of a secondary surfactant, 2 to 9.4 parts of a cationic surface active agent, 10 to 15 parts of skin moistening grease, 4 to 8 parts of a pearling agent, 6 to 19 parts of a moisture preserving agent, 3 to 8 parts of a pH adjusting agent, 6 to 14 parts of a viscosity regulator, 0.6 to 3 parts of an antibacterial agent, 5 to 10 parts of a ginger extract and 1 to 5 parts of lavender essential oil. The skin moistening grease of the silicone oil-free shampoo replaces silicone oil in the conventional shampoo; the phenomenon that hair loss is easily caused by using the silicone oil is prevented; the skin moistening grease can make hair soft and smooth and easy to comb; a small amount of ketoconazole is added, so that the shampoo has the function of removing fungi, the irritation is low, and the phenomena of hair loss and hair breakage are avoided; the cationic surface active agent can prevent static electricity and avoid the trouble of the static electricity in winter; therefore, the shampoo is diversified in function, and does not harm human health.

The invention relates to the technical field of daily chemicals, in particular to a composition for nourishing hair and scalps before hair washing. The composition for nourishing the hair and the scalps before hair washingis prepared from the following raw materials in percentage by weight: 0.1-5% of nonionic thickeners, 0.1-10% of cationic polysaccharide polymers, 0.1-10% of cationic surfactantsand the balance of pure water, wherein the molecular weight of the cationic surfactants is at least greater than 300 g / mol. The composition has the advantages that the composition contains no grease reducing the cleaning power of the surfactants; the hair can be conditioned without injuries to the scalps before hair washing through reasonable framework construction, synergistic interaction among raw materials and limitation of key parameters of the raw materials, so that the knotting frequency is reduced, and the probability of hair breakage is further lowered.

The invention belongs to the field of daily chemicals. A hair conditioner capable of preventing hair loss and nourishing hair comprises the following components in percentage by mass: 1-6% of a thickening agent, 1-2% of a cationic surfactant, 1-10% of proline, 0.1-0.5% of a cacumen biotae extract, 0.1-0.5% of a ginseng extract, 0.1-1% of a ginger extract, 0.1-1% of a cordyceps militaris extract, 0.1-1% of an astragalus membranacus root extract, 0.1-2% of a saccharide isomeride and the balance of water. The hair conditioner disclosed by the invention is mild, low in irritation, high in transdermal absorption rate, capable of controlling oil and astringing, moisturizing, nourishing scalp, strengthening hair roots, inhibiting bacteria and diminishing inflammation, regulating water-oil balance of skin, maintaining steady state of scalp environment, activating proliferation and differentiation of hair growth cells, repairing hair follicle structures, reconstructing skin barriers, effectively fixing and nourishing hair, nourishing hair and growing hair and reducing alopecia and hair breakage. The hair is soft, glossy, fresh and fluffy after the hair conditioner is used, is not easy to be frizzy and knotted and is easy to comb.

The present invention provides a special nutrient for cats. The special nutrient comprises the following raw materials in parts by weight: 30-50 parts of whey protein powder, 8-18 parts of soybean meal, 10-22 parts of micro-ecology live micro-organism preparation, 5-11 parts of oyster powder, 10-18 parts of buckwheat flour, 0.6-4 parts of ultra-fine calcium powder, 1-3 parts of medical stones, 2-5parts of rhizoma polygonati, 3-7 parts of asparagus officinalis, 2-4 parts of boehmeria gracilis, 8-17 parts of radix cynanchi bungei, 0.3-2 parts of herba lycopi, 0.3-2 parts of radix dipsaci, 1-4 parts of white atractylodes rhizome and 0.5-3 parts of vitex negundo var. cannabifolia. The special nutrient can comprehensively improve fur health of the cats, stimulates broken hair regeneration, prevents hair loss and hair breakage, prevents hair from splitting, protects hair follicle, improves hair quality, enables clothing hair to be elastic, prevents the hair from balling-up, comprehensivelyenhances immunity, replenishes spleen and stomach, nourishes qi and blood, enables pets to have spirit and the clothing hair to be flourishing, soft, smooth, bright in color and luster, and elastic, can increase the hair quality and brightens hair color.

A hair measuring assembly capable of being operated by a single hand of a user and including a collection assembly, including a hair retaining and measuring portion movably mounted on a body and selectively disposable between a collecting position and a retaining and measuring position. The single handed manipulation of a hand grip, concurrently disposes a plurality of two grip segments into either an open or a closed orientation, thereby forcing the hair retaining and measuring portion between the collecting and hair retaining and measuring positions. A “single use” cartridge for carrying out the collection, retention and measurement of hair and also hair breakage is presented. The “single use” cartridge includes suitable structure for mounting and operable attachment to the hair measuring assembly by a person, without regard to whether he or she is left-handed or right-handed.