Solution:
20 teeth appear twice.
Human teeth are diphyodont. Milk teeth are 20 and permanent teeth are 32 in number. So, 20 are replaced and 12 appear only once.
How many teeth appear twice in a man?
20 teeth appear twice.
Human teeth are diphyodont. Milk teeth are 20 and permanent teeth are 32 in number. So, 20 are replaced and 12 appear only once.