A 70-year-old will spend how much of his/her life chewing with their deciduous teeth?
  1. 6%
  2. 12%
  3. 20%
  4. 40%
Explanation
Answer: A - An individual who is 70 years old will spend 91% of his/her life chewing with permanent teeth, but the same person will spend only 6% of his/her life chewing with the primary/deciduous teeth.
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