critical pH


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crit·i·cal pH

the pH range, about 5.5, at which saliva ceases to be saturated with respect to calcium and phosphate, and below which tooth mineral and other hard tissue lose calcium.

crit·i·cal pH

(kriti-kăl)
The pH range, about 5.5, at which saliva ceases to be saturated with respect to calcium and phosphate, and below which tooth mineral and other hard tissues lose calcium.
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It has been suggested that critical pH would be lowest of all in this type of plaque as it seemed possible that these elements (calcium and phosphorous) would pass into solution with a fall in pH and maintain the aqueous phase in a saturated condition [Schroeder, 1963].