Inclusion criteria:  Patients aged between 7 and 10 years With an indication for conservative and/or endodontic care of at least 2 temporary molars belonging to the same dental arch, unilateral or bilateral, and equivalent in terms of caries and symptoms With dental anxiety ASA I patients  Exclusion criteria:  Patient with a history of MEOPA or virtual reality sedation for dental treatment Patient refusing to do preoperative intra-oral x-rays Patient with one of the MEOPA contraindications Patient with a history of post-operative nausea vomiting or motion sickness Patient with visual or hearing disorders Patient presenting with a psychiatric pathology or having taken psychotropic drugs in the 8 weeks preceding the 1st visit and during the duration of the study Patient with claustrophobia Patient without French Social Security coverage Lack of consent from the holders of parental authority to participate in the study