If your child has to wore one, you should go to pediatric dentistry for some tips and advices such as: it is recommended to wear it at least 6 month after the braces first came off. Make sure you buy some retainer cases, so your child doesn't lose it, because a new one can cost up to $300. Put one in his school bag, in your car, or at home. After this period is over, your pediatric dentist will probably tell that he has to wear it only at night for at least 4 to 6 additional months. It takes many months for the periodontal ligaments and bone to "remember" the new position of his teeth and keep them in place. The retainer helps keep them in their proper new positions. It's important for your child to wear the retainer exactly as your pediatric dentist recommends. Otherwise, his teeth may shift, especially if he stops wearing it in the first two years after the braces came off. He will probably have to wear a retainer regularly for a long period of time, at least one night a weak, but he will have a very beautiful smile.
In pediatric dentistry you'll also find advice about how to clean a retainer. Clean it every night the way your pediatric dentist recommends. Rinse it with warm water after taking it out of his mouth, and also before putting it back in later! This will help prevent bacterial buildup. You can brush a Hawley retainer with a toothbrush and a tiny bit of toothpaste, but that is not recommended for a clear Essix retainer, as it can get scratched.
Lehi Pediatric Dentistry