Abstract: A laser handpiece, which has an outer guide sleeve in which a light guide is contained, is provided with a releasable clamping device. By the rotation of a rotary ring on the guide sleeve, the clamping device can be released and an advancing of the light guide, either manually or automatically, can be guaranteed.

Abstract: A dental laser treatment instrument comprising a handpiece that is connected to a supply tube for supplying laser radiation and a treatment fluid, and has a long extraction element on the front end thereof, for emitting the laser radiation. The extraction element has a long optical fiber and a cylindrical or sleeve-type holding element which surrounds the optical fiber in a region facing the front end of the fiber, at a distance from said fiber, in order to form a fluid channel. The fluid channel is connected to a supply line extending through the handpiece. According to the invention, the sleeve-type holding element projects past the front optical output end of the optical fiber.