title: An aid in the use of relative analgesia.
mesh_terms: D000766:Anesthesia, Dental / Q000379:methods*; D003116:Color; D006801:Humans; D006993:Hypnotics and Sedatives; D008029:Lighting; D009609:Nitrous Oxide
chemical_list: D006993:Hypnotics and Sedatives; D009609:Nitrous Oxide