Abstract: A buccal hygiene apparatus which includes a casing enclosing a hydraulic pump and motor unit. A handpiece is connected to the casing by a flexible tubing. A reservoir is removably fittable on the casing in a position for supplying water to the pump and motor unit via an outlet in the bottom of the reservoir. The outlet includes a valve for closing it when the reservoir is removed from the casing and opening it when the reservoir is fitted on the casing. A reservoir is provided with a gripping member and is of smaller dimensions than the casing.