The purpose of this clinical investigation is to evaluate acute and longlasting side effects in patients undergoing radiotherapy for cancer treatment in the head and neck area.

The "Dental Team" at the Department for Oral and Maxillofacial Surgery in Trondheim takes care of patients before, during and also after radiotherapy in the head and neck area. In spite of the use of advanced radiation protocols and prevention measures such as fluoridation splints the team observes significant side effects, both under radiation and also on the long term after concluding treatment. Common problems are for example dermal and mucosal damages, reduced salivation, dysphagia and lesions of the teeth. Aim of the study is the investigation and documentation of side effects and complications in relation to the oral cavity. During the acute and postradiation phase a continuous follow-up over a longer lasting period is proceeded with registration of all relevant parameters. This includes among others dental status and evaluation of quality of life.

Inclusion Criteria:

• radiation concerning the oral cavity
• follow-up at the Dental Team

Exclusion Criteria:

• refused approval
• survival prognosis under one year

All cancer patients with radiation therapy concerning the oral cavity who are in care of the Detal Team at St.Olavs University Hospital