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How big a cavity can a tooth have to have an onlay rather than an extraction?

How far shrunk can a tooth be to have an onlay rather than an extraction?

If the bone is fine, and gum is fine, the tooth is solid but the tooth has a big hole then is it ok to have an onlay?

Even if most of the crown has gone and bit of the pulp is exposed?
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The choice of restoration depends on remaining tooth strucuture, dentist's experience and knowledge. It's a very subjective issue.
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Avatar universal
sounds like a crown might be better. you might need a root canal. check with your dentist since extraction should be a last resort.
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