H.G.
My two daughters have had cavities filled using laughing gas. They were about 5 & 6 at the time, so a little older, but definitly super scared. I highly recommend the gas, they put a little nose on that smells great, grape, orange, bubblegum. Then they just basically breathe thru their nose & it make them very relaxed. They both layed there really relaxed & my six year old even fell asleep!