Answers

2015-09-23T15:40:45+05:30
Actually the science behind the fact is that due to continuous action of germs by forming a layer deposite of sugar which affects of PH level. In older days it becomes fast due to more action of germs.
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2015-09-23T17:19:59+05:30
ACTUALLY IT IS NOT COVERED WITH GUMS THAT IS WHY THE INTERIOR TEETH  IS LOOSED BY THE PEOPLE.
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