The invention relates to a method for ablating solid material in the oral cavity, in particular jaw bones. Known systems have disadvantages in respect of accuracy and damage to the surrounding tissue. The aim of the invention is to provide a system which allows for simple, safe, gentle, reliable and accurate ablation. The aim is achieved by the use of a fixing device, in particular a dental splint, and an insertion device which can be rigidly connected thereto and is designed in particular to introduce laser radiation and thereby ablate material. After being connected, the insertion device has a fixed, in particular predetermined, position.
