Around the first two yrs, retainers can changeover to nighttime wear only, and there is a chance to minimize use further after the 3rd year. Extensive-time period, wearing retainers a couple of evenings every week for a life time is advised to keep up teeth alignment. วัสดุทำจากพลาสติก อาจคงทนน้อยกว่ารีเทนเนอร์แบบลวด ทำให้เกิดปัญหาแตกหักได้ง่ายกว่า A: https://pikm318yce9.wikidirective.com/user