Hand-operated instrument for dental care or tooth treatment

Hand-operated instrument for dental care or tooth treatment having an electric drive, comprising a hand-grip portion, a slender instrument neck portion having one end integral with said hand-grip portion and a free end, a drive motor of the electric drive and a fluid reservoir disposed in said hand-grip portion, a working implement integral with said free end of said neck portion, means including a fluid duct at least partially disposed in said neck portion for supplying fluid from said reservoir to said working implement, means including drive elements at least partially disposed in said neck portion and being driven by said drive motor for driving said working implement, said drive elements including a tubular drive shaft, and said fluid duct being disposed in said tubular drive shaft, an implement coupling for coupling said working implement to said free end of said neck portion, and a miter gear formed of two gears connecting said implement coupling to said drive shaft, said fluid duct being tubular in shape and said drive shaft being rotatably supported on said fluid duct, and said fluid duct having a bend formed therein which forms a bearing for both gears of said miter gear at said implement coupling.