In dentistry very often soft tissue has to be cut. It has become customary to cut soft tissue, in particular gum or gingiva, or to disinfect pockets in the gingiva that exist at the neck of teeth with the help of laser light. The same applies to a disinfection of the channel in the root of teeth (endodontic treatment). Prior art concepts of cutting soft tissue rely on the use of red or infrared diode lasers and lead to an excessive heating the tissue and damaging of surrounding tissue. We suggest a device for treatment comprising a laser diode with a wavelength of 445 ± 15 nm, in particular 445 ± 10 nm, for providing the laser light. The use of e.g. 445 nm for cutting soft tissues has nume-rous advantages.
