Each person’s specific dental situation is different, the orthodontic time will be different: 1, orthodontic teeth if the pre-functional orthodontic treatment before the age of 12, it usually takes six months to a year, if the permanent period after the age of 12 and then orthodontic treatment, the average time is 1.5 to 2 years; 2, orthodontic progress with the degree of cooperation of patients, the interval between follow-up visits and the complexity of the orthodontic It varies from person to person, complex malocclusion takes longer than simple malocclusion, extracted cases take longer than non-extracted cases, and bony malocclusion takes longer than non-bony malocclusion, averaging about 2 years; 3, if it is an adult case after 20 years old or a special complex case, it will take 3 years or longer. Prevention, early detection and early treatment.