Question 2 of 10
How many times do teeth change during a person's life?
A: 1
ERROR
Correct answer: In an ordinary person, teeth change twice during a lifetime: first 20 milk teeth appear, and then 32 true teeth.
B: 2
RIGHT
Explanation: In a normal person, teeth change twice during a lifetime: first 20 milk teeth appear, and then 32 true teeth.
C: 3
ERROR
Correct answer: In an ordinary person, teeth change twice during a lifetime: first 20 milk teeth appear, and then 32 true teeth.
D: 4
ERROR
Correct answer: In an ordinary person, teeth change twice during a lifetime: first 20 milk teeth appear, and then 32 true teeth.