Abstract: Disclosure is made of an invention for a rotary electric toothbrush, of a head segment demountably attached to a body segment, and the head segment having a gear train in the top of the head segment such that the angle between the center line of the end brush and the drive shaft can be from 70.degree. to 90.degree. and a rechargeable battery and motor is contained in the body segment. The head segment is mounted on the body segment by means of raised buttons of the body segment fitting in dimples of the head segment.