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It depends on which parts of the the tooth are considered, but pH 6.7 and below is an accurate answer in a general sense. In a living organism, a tooth is constantly being demineralised and remineralised and at pH 5.5 the rates of demineralisation and remineralisation are roughly equal. Below pH 5.5 the rate of demineralisation is the greater and the tooth is effectively being corroded away.

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