Extractions are performed when a tooth or teeth has to be removed or when it cannot be saved. Your dentist may recommend that you extract a tooth or teeth if you have tooth decay or a broken tooth. Your dentist may NutriO2 also recommend this procedure if fixing a damaged tooth is not practical.When a large part of a tooth is broken away or decayed, it can be restored with a crown. Crowns are usually constructed with porcelain or gold. Crowns are strong and durable, and they function like natural teeth.If you have one or more missing teeth, you can replace them with fixed or removable bridges. Not only does missing teeth affect a person's appearance, but it can cause shifting of the teeth, and an increased risk of tooth decay and periodontal disease.