In our clinical work, we often encounter many parents who are uncertain about the various problems that arise when their children change their teeth. In order to reduce parents’ unnecessary anxiety, here are some considerations for children’s tooth replacement. I. What is tooth replacement? When a child enters the period of tooth replacement, the permanent teeth erupt, resulting in the resorption, loosening and orderly loss of the roots of the milk teeth, and the permanent teeth gradually erupt in the empty space. The period of tooth replacement begins at the age of 6 and ends at the age of 12 to 13. The order of tooth replacement is generally as follows: Second, quietly appear, no “replacement” “six-year-old teeth” is which one? When a child reaches about six years old, the first permanent molar, also known as the “sixth-age tooth”, will grow quietly behind the last milk molar on the upper and lower left and right. Many parents do not know its existence, and even think it will be replaced, so they neglect to take care of it, resulting in many children’s sixth-age teeth start to decay early. Parents must pay attention! Sixth-age teeth are not replaced! Sixth-age teeth will not be replaced! Sixth-age teeth will not be replaced! After this tooth erupts, you must pay attention to clean it and have the sulcus closed in time. Parents can take a look at their children’s tooth replacement status.