Remineralization of Tooth

# The pH at which the remineralisation of damaged tooth structure occurs is said to be:
 A. 5.5
 B. 2.5
 C. 3.5
 D. 6.2

The correct answer is A. 5.5.

5.5 for 20 to 50 minutes is called as critical pH below which the tooth demineralizes and above remineralization occurs.

The critical pH for root surface demineralization is approximately 6 to 6.7

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