Electronic toothbrush and electronic brush

摘要

An electronic toothbrush comprising: a brush head portion having a bristle portion, to be inserted into an oral cavity, for washing teeth; and a holder portion to be exposed outside the oral cavity, an n-type semiconductor is provided so as to be capable of receiving external light; and a battery is provided so as to be capable of superposing an electric potential on the n-type semiconductor. <IMAGE>