Don't worry about the titanium it should be fine. What you should reconsider is what the dentist will be filling your "decayed teeth" in with. If you are 23 I highly doubt any of your teeth are "decayed" and can probably just be left alone without any problems. If he were to put composite fillings in, for instance, you would have xeno estrogens flooding your bloodstream. Ceramic is the lesser of evils... but really, people have been fine without these madmen drilling and "restoring" their teeth for thousands of years. It is pure greed that drives these people to drill our teeth apart and fill them with poisons. And it is pure evil. Take your power back and don't let this guy mess around with your teeth more than he has to to get the poison out.