Abstract: Apparatus for use in personal dental hygiene care comprising an elongated member formed at least in part of a piezoelectric member with a pair of contacting surfaces intermediate the respective ends thereof with a brush member adapted to be received within the human mouth and moved across tooth and gingival surfaces and extending from one end of the elongated member. A casing adapted to be held in the hand is provided and is of a length at least equal to the piezoelectric member and having an elongated bore adapted to receive the piezoelectric member of the elongated member therein. Sealing means in the bore to engage the elongated member in readily releasable and in a fluid-tight fashion is used.