Efficacy of Repeated Locoregional Anesthetics Blocks With Bupivacaine in Patients Suffering of Chronic Dentoalveolar Pain.

Inclusion Criteria: * Patient, male or female, over 18, with persistent dentoalveolar pain defined according to the criteria: * daily presence (\> 2 hours / day and for more than 3 months) and continues pain; * located at one or more teeth or at the level of the alveolar bone; * not following a nervous path; * clinical, radiological and neurological examinations showing no cause organic visible; * dental causes excluded by appropriate tests; * local or systemic pathologies related to pain apart. * Pain intensity greater than or equal to 4/10 on numerical scale * Patient informed of the constraints of the study and having given his written consent. Benefiting of a social security scheme. * Mastering correctly French. Exclusion Criteria: * Pregnant women, breastfeeding, or likely to be pregnant. * Oral pain of known origin (cancerous, infectious, traumatic). * Patient having modified (stopped, started or modified dosage) in the last 2 month local or systemic medication that may interfere with the study results (for example, patients taking long-range psychotropic drugs will not be excluded). * All medical pathology judged by the investigator as not compatible with the study. * Known hypersensitivity to local amide-bound anesthetics or to any of the excipients * Treatment anticoagulant or known disorder of blood * Porphyria. * Atrioventricular conduction requiring training permanent electrosystol not yet realized. * Epilepsy not controlled by a treatment. * Patient non-cooperating, not speaking or not reading fluently French or in the impossibility of understanding the principle of a pain scale or understanding the study or to sign an informed consent. * Patient under guardianship, curatorship, or deprived of liberties.