Feasibility, prospective, monocentric study aiming to evaluate the interest of a written information guide, given and explained by the dental assistant, on the improvement of the oral hygiene of patients with ORL cancer at 3 months post-radiotherapy.

The study will be conducted on a population of 44 patients with ORL cancer requiring radiation treatment.

Each patient will be followed during 3 months post-radiotherapy (follow-up for up to 12 months post-inclusion).

Inclusion Criteria:

1. Age ≥ 18 years at study entry.
2. Patient with ORL cancer requiring radiotherapy (+/- associated chemotherapy).
3. Patient with a plaque index > or = 30%.
4. Patient affiliated to a social security system in France.
5. Patient having signed informed consent prior to inclusion in the study and prior to any specific procedure for the study.

Exclusion Criteria:

1. Pregnant or lactating women.
2. Any psychological, familial, geographic or sociological condition that does not allow for compliance with the medical follow-up and/or procedures outlined in the study protocol.
3. Patient who has forfeited his/her freedom by administrative or legal award or who is under legal protection (curatorship and guardianship, protection of justice).

Patient with ORL cancer for which radiotherapy (+/- associated chemotherapy) is indicated.