If you wore braces or clear aligners in the past, you probably remember those first few months and years after treatment well—your teeth looked and felt their best and remained perfectly straight for quite some time. However, things happen, and you might’ve started to notice them shifting back into their original and incorrect positions. You may be wondering if wearing your old retainer is a quick and easy fix for this issue, but the truth is, this probably won’t do much good. Here’s what you need to know.