The first line of defense is a filling, but if the tooth decay is serious you may need a root canal. But you can only do this if the root is still healthy. If not, there is no choice but to extract the rotten tooth. With a root canal, the dentist will drill down the tooth to clean out the decay.

What happens if decayed tooth is not removed?

If it is not removed, it will harden and turn into tartar (calculus). The acids in plaque damage the enamel covering your teeth. It also creates holes in the tooth called cavities. Cavities usually do not hurt, unless they grow very large and affect nerves or cause a tooth fracture.

What will a dentist do for a decaying tooth?

Fillings. If you have a typical cavity, your dentist will remove the decayed tooth tissue and then restore the tooth by filling it with a filling material. Root canal. If the damage to the tooth and/or an infection spreads to the pulp (inside of the tooth), you might need a root canal.