A tooth filling is a material made of composite resin. It can be hardened in-chair by our dentist using a special blue light. This allows our dentist to fabricate a restoration or cosmetic procedure in a single visit. The tooth filling begins as a kind of paste that the dentist applies directly to the tooth. What happens if you get a cavity on your front teeth? “If the decay gets large enough, part of the tooth may fracture off, leaving a large visible hole, and the tooth may be sensitive to biting pressure. Bad breath and or a bad taste in the mouth are also symptoms." Cavities on the front teeth are the easiest to see and will look like a brown or black spot.