 hi i need dental work most likely very soon i may need many fillings many crowns a cleaning sealants i will get laughing gas which is scented too i may pick cherry smell they also use a papoose board with head immobilizer so im safe and calm will papoose board be snug will gas calm me will head strap be snug  i do have autism and special needs ok i would wear pajamas and take a stuffed animal too may be a long visit any advice...?