Interest of Re-oxygenation After Inhalation of 50% Nitrous Oxide / 50% Oxygen Premix in Dental Cares

Inclusion Criteria: * From 1 year old * anxious or phobic patients * very young children requiring selective dental cares * mental deficient patients * ASA 1 or ASA 2 patients Exclusion Criteria: * ASA 3 or ASA 4 patients * contraindication linked to the experimental product * patients with mental disorder incompatible with the motory test * patients that have received anxiolytic treatment less than 2 hours before the dental care