There are some situations where a child cannot relax during a dental procedure even with laughing gas.  They may have had a bad experience or for whatever any other  reason they just do not feel comfortable.  This is when enteral sedation is administered.   Your child is given medication either by pill or liquid 30 to 45 minutes before treatment begins.  Your child will still be awake during the procedure but will feel much more relaxed and not as anxious.