Patent ID: 8393037

Claim:
An electric toothbrush, comprising: a brush; a driver operable to move the brush; a posture detection device operable to detect a posture of the brush based on an output of an acceleration sensor; a part estimation device operable to estimate a brushing part being brushed among a plurality of parts defined by dividing a surface of a tooth row based on the detected posture; a time measurement device operable to measure brushing time for each part; an evaluation output device operable to evaluate and output a brushing result for each part based on the measured brushing time; a brush angle estimation device operable to estimate a brush angle at each brushing part, said brush angle representing an angle of the brush relative to a tooth axis based on the detected posture; and an optimum value or range setting device operable to set optimum values or ranges of brush angles separately for different brushing parts, wherein the evaluation output device further evaluates and outputs the brushing result for each brushing part based on a comparison between the estimated brush angle and the optimum value or range set for the corresponding brushing part.