So that big day comes, you are done with your orthodontics, your teeth look great! How long do you need to wear those retainers? My answer is: as long as you want your teeth to stay straight! Ideally have a little metal wire bonded to the back of your lower front teeth (that is what I have) and you will have no worries about your bottom teeth moving. Usually a removable retainer for the top teeth to wear during sleep works well. For those of us who clench or grind, a retainer that also acts as a night guard can be a good idea. The bottom line: make retainers a part of your lifetime routine and you will have a lifetime of straight teeth.