Many people are concerned about one question: when is the most appropriate time to get orthodontic treatment? Generally speaking, after the baby teeth grow in around the age of 3, parents should check their children’s teeth to see if they have “enameled teeth” (lower teeth encircling upper teeth), especially if family members (three generations of direct and collateral relatives) have this condition, then they should take their children to the regular hospital for examination and treatment. The principle of treatment is The principle of treatment is “early detection and early treatment”, and the best time for treatment is between 3 and 6 years old. The former will not recur after treatment and tooth replacement, while the latter will probably recur because of the growth and development factor, so wait for the second phase of orthodontic treatment after the replacement of milk teeth. Liu Yi, Department of Orthodontics, Shandong University Stomatology Hospital