hello i have autism and special needs  and may need dental work  soon  they will use laughing gas  liquid versed and   the adult sized rainbow papoose board with head immobilizer  will  the papoose board be snug  will gas help will versed taste bad   the work i might need is crowns  and fillings and a cleaning and sealants  the place asked that  if i need dental work too dress comfy  are pajamas ok  will it be a scary visit  any kind support helps