Simple cavities are treated with a filling. The doctor will remove the decayed tooth tissue, and replace that removed tooth structure with a filling. The filling will either be a metal amalgam, or will be a tooth-colored composite. Some cavities are too large for a filling. If the damage is very extensive, and too much of the tooth tissue has decayed, a dental crown may be needed. If the cavity has been left untreated, and the tooth has become infected, this serious condition is called an abscess, which might require a root canal.
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