When I was little I had the best dentist in the world. I didn't have a cavity during that time, but I did have two teeth pulled. Looking back on it I find it incredibly what he must have done. For one thing, I had no idea a gigantic needle was involved. Then I was just sitting there, and suddenly the dentist was showing me my tooth. I had no idea what had happened, and only looking back to I realize that he must have given me novacaine without me noticing, and pulled the tooth without me noticing. After that my luck in dentists hasn't been as great, but I think sometimes a good experience early means you can deal with worse ones later. I had the same thing getting my blood drawn. When I was little the first time I had it done it felt like a prick and then nothing, and now if it hurts a bit more it doesn't matter that much.