Abstract: A tooth-brush carries its own supply of tooth paste in a removable cartridge inserted into the tooth-brush handle. The tooth paste is discharged through a passage from the cartridge to a flexible nipple located between the tooth-brush bristles. A piston is located in the cartridge to push the tooth paste towards the bristles. The piston has a groove engaging a longitudinal rib of the cartridge to prevent rotation of the piston. A screw is threaded through the piston and has a head urged forwardly by a spring abutting against a cap rigid with the tooth-brush handle. Upon screwing of the screw by a knob at the end of the tooth-brush body, the screw is caused to move rearwardly to a limit position to thereby compress the spring. The cocked spring produces slow and uniform discharge of a measured amount of tooth paste over the bristles by moving the screw and, therefore, the piston forwardly.