Dental treatment appliance

A dental cleaning appliance, preferably a toothbrush or interdental cleaning device, includes a handle (12, Fig 1), a fluid reservoir (32, Fig 1) for storing a working fluid, and a fluid delivery system for receiving working fluid from the reservoir and for delivering working fluid to the oral cavity of a user. The fluid reservoir includes a fluid port 76 from which fluid is dispensed from the fluid reservoir, and also through which the fluid reservoir is replenished. The fluid reservoir is moveable along the handle between a first position in which the fluid port is connected to the fluid delivery system, and a second position in which the fluid port is exposed to allow the fluid reservoir to be replenished. In a preferred arrangement the reservoir is slid along a second tubular section 36 of the handle which has a reduced diameter with respect to a first section 18. The handle preferably also comprises a seat 74 for receiving the fluid reservoir when in its first position.