Study Aimed at Detecting Potential Abuse of Nitrous Oxide in Children During Dental Care

Inclusion Criteria: * Children aged 3 to 15 years * Requiring dental care under MEOPA * Not opposing, as well as his parents, his participation in the study * Not having difficulties tracking (going on holiday, imminent change, remoteness, lack of motivation) Exclusion Criteria: Excluded patients are those whose dental care can be made to the vigil state, or on the contrary, will present a number of important care, justifying general anesthesia. Also excluded will be children whose parents no longer have parental authority or whose parents are divorced or divorcing.