Whether a tooth with caries can be extracted depends on the extent of the decay. If the decay is shallow, it can be treated with a one-time filling. If the decay is deep, reaching the nerve, nerve-killing treatment is required, followed by anti-inflammation measures and, after inflammation control, root canal filling. In other words, teeth should be preserved through root canal treatment whenever possible and not extracted. If the caries has reached the deep layers of the tooth dentin, or is at risk of causing a perforation, such conditions are considered non-salvageable and the tooth should be promptly extracted. After extraction, timely dental prosthetics should be placed.