The invention provides a special electric toothbrush for cleaning tooth crevices. The special electric toothbrush comprises a brush head assembly, a transmission assembly, a brush handle and a power assembly, wherein the power assembly is connected with the brush head assembly through the transmission assembly; and the brush head assembly is arranged at the end part of the brush handle and comprises a support rod, a transverse middle part, a vertical left part, a vertical right part, a left side brush and a right side brush, the vertical left part, the vertical right part and the transverse middle part form a U-shaped frame, the middle of the transverse middle part is vertically connected to the end part of the support rod, the left side brush is arranged on the vertical left part, the right side brush is arranged on the vertical right part, the left side brush and the right side brush are oppositely arranged, and a gap is formed between the end part of the left side brush and the endpart of the right side brush. According to the special electric toothbrush, the tooth crevices on the tongue side and the lip sides can be simultaneously cleaned, and the cleaning is simple, convenient and efficient; and compared with manual cleaning, the special electric toothbrush has the advantages that the cleaning speed can be increased, the cleaning effect can be improved, the periodontitiscan be prevented, the time and the labor are saved, the cleaning time is effectively shortened by 60% or above, and the special electric toothbrush is suitable for being used by patients.