Gold has the longest lifespan, followed by amalgams and then composites. At the site of the decay the dentists drills out the decay and shapes the tooth to hold the filling. If a tooth's pulp, which contains blood vessels and nerves, becomes infected because of decay or injury, root-canal treatment is often the only way to save your tooth and repair the damage. Usually, this type of treatment is performed in 1-3 visits, depending upon the pulp's condition. The material used to fill the root canal will probably last a lifetime, but eventually the filling or crown may need to be replaced.
Pulp becomes damaged and infection spreads to the bone and tissues.
An abscess forms at the roots. After the tooth is numbed, the dentists makes an opening in it to reach the pulp chamber. The tooth is then filled. The tooth may need a crown as well. Crowns may also be required after a root canal or when a tooth cracks or breaks.