Is there a point of no return to the tooth where it cannot be saved by diet?

Yes. There is such a point of no return. Typically the point of no return is when the tooth nerve dies, or is mostly dead. Prior to this point, the tooth can usually be saved by diet alone.

The body has an amazing ability, when the conditions internally are correct, to repair and restore itself. There are cases where people have a tooth with a dead nerve, a tooth with a crown or other severe trauma to it, or people who have mercury poisoning surrounding the tooth. In these conditions, it can be difficult to save a tooth through restoring your health. But it surely is always worth trying.

The book Cure Tooth Decay explains in more detail how to save decayed teeth from the dental drill or further tooth decay.

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