You may be wondering, “If it’s called a filling, why does it involve drilling a hole?” Fillings aren’t like Band-Aids: we can’t just cover up the damage & expect it to get better. Unlike pretty much every other part of you body, teeth cannot heal themselves when they get damaged or infected. In order to restore your tooth back to the way it should be, we have to remove the decay first. That’s what we’re doing when we use the drill when applying a filling.