Milk Teeth: 20 Teeth, Got 8 molars, Thin layer of enamel and dentine, Smaller size and not strong, Short life span, Start to grow at 6 months and complete at 3 years old, Permanent Teeth: 32 teeth, Got 20 molars, Thick layers of enamel and dentine, Bigger size and stronger, Long life span, Start to grow at 6 years and complete at years old,

Differences between Teeth group

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