A boy has 16 permanent teeth and 8 temporary teeth. How old is he? a) 9 years b) 10 years c) 11 years d) 12 years Answer: 10 years Competitive exams often include such MCQs, and memorizing the numbers can be frustrating. Here’s a simple trick to calculate age based on the number of temporary and permanent teeth, specifically during the mixed dentition period. Key Points: All temporary (deciduous) teeth disappear by age 12, meaning the number of temporary teeth at 12 years is 0 . Permanent teeth start erupting at age 6, so the number of permanent teeth at 6 years is 0 . A child has a total of 20 temporary teeth , all of which appear by age 6. The mixed dentition period occurs between ages 6 and 11 Trick 1 Lets make a table Age in years Temporary tooth Permanent tooth Comments 12 0 24 The sum always remains 24. 11 4 ...
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