The restorative and surgical odontological department at the Nantes University Hospital frequently hosts patients with a severely degraded oral condition who has never benefited from a removable prosthetic rehabilitation. The chosen treatment plan consists most of the time in extracting all the residual teeth at one or both arches with the immediate insertion of a complete removable prosthesis performed prior to the extractions. This prosthesis is adapted by regular relining during the osteomucosal healing and is replaced by a usage removable prosthesis on average 6 months after the extractions.

The transition from dentate state (even dilapidated) to toothless state can be a source of discomfort and impairment and lead to a decrease of life's quality for patients. The purpose of this study is to evaluate oral health of the patients at the different stages of prosthetic rehabilitation by using GOHAI (Geriatric Oral Health Assessment Index).

Patients are selected at the beginning of their prosthetic rehabilitation and selected patients give their consent for the participation at the clinical trial. The filling of the GOHAI questionnaire is performed in 3 steps:1- before treatment, 2- after teeth extractions and the delivering of immediate complete denture or without immediate prosthetic rehabilitation and 3-during inspection visits after the delivery of the definitive denture.

Inclusion Criteria:

• An adult man or a woman, speaking and understanding French, benefiting from social security cover.
• Patient presenting one or more teeth to be extracted, these extractions resulting in a complete uni or bimaxillary edentulism rehabilitated or not by an immediate complete removable prosthesis.

Exclusion Criteria:

• Patients under the age of majority, patients under protection, protected persons, patients refusing to participate in the study, patients whose follow-up can't be performed, patients who don't speak French and patients who don't benefit from social coverage.
• Patients rehabilitated by immediate partial removable prosthesis (persistence of teeth on the rehabilitated arch).

Patients treated for prosthetic rehabilitation with the need for a total edentemant of at least one arch, and setting up a complete removable prosthesis