most cavities hide and eat the inside of the tooth b4 you even notice.thats why when you do have a cavity they have to drill a bunch of tooth out even the the hole looks small.when you go the dentist and they give you novacaine just tell them you still can feel it so they will give you even more novacaine.then you wont feel anything at all when they drill ya.no big deal really.its just a little drilling.and some filling and you will be outta there.then youll drool on yourself for another 4 hours because you wont be able to feel your face.
This will be a bad time to pick up chicks or go on a job interview........just in case that is your plans
All kidding aside you are 19 and have never had dental work? Wow...