459. The range of level of fluoride secreted by the glands into the mouth is_____________?

A. 0.004-0.005 ppm
B. 0.006-0.007 ppm
C. 0.007-0.005 ppm
D. 0.007-0.08 ppm
✅ The correct answer is option C. 0.007-0.005 ppm.

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