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Q.

Tooth decay is caused when the pH is below______
 

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a

5.5

b

5.7

c

5.6

d

5.8

answer is A.

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Detailed Solution

  • Tooth decay starts when the pH of the mouth is less than 5.5 
  • Tooth enamel is made up of calcium hydroxyapatite (a crystalline form of calcium phosphate)and  is the hardest substance in the body. 
  • This substance does not dissolve in water, but gets corroded when the pH in the mouth is below 5.5
     
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