The intervention takes place under local anaesthesia. For an intervention in the maxila there will be injected both from the outside and from the inside, for one in the mandible it wil be injected behind the wisdom tooth (if present), further to the front both from the inside and the outside directly at the tooth to be treated. In order to unveil the root tip, a section in the gingiva is primarily made unvealing the bone over the root tip. Then, using a bur, the infection is unvealed, the root tip is cut (resected) and the inflammed tissue is removed. Through a root canal treatment made before or during the operation, the root canal and the section surface are being sealed up. Afterwards, the wound is being sewed and if necessary, an anti-inflammatory medicine is applied.