You can usually still straighten your teeth in your thirties. The age requirement for orthodontic treatment is not an absolute value. If a patient in his or her thirties wants to have orthodontic treatment, he or she can do so as long as he or she has healthy periodontal tissues, as well as no significant TMJ or periodontal disease, or other systemic and local contraindications. Therefore, it is generally still possible to straighten teeth in your thirties. Patients are advised to go to a regular dental clinic or the stomatology department of a general hospital to be treated under the correct operation of the doctor to avoid delay. It is recommended to develop good oral hygiene habits during orthodontic treatment, brush your teeth on time, and go to the dentist for regular dental checkups.