If you have finished with your orthodontic treatment and are wearing retainers (or will be soon), this is a special place to connect with others in your (enviable) situation. Ask a question or make a comment about life post-braces.
It's just plastic. You'll be fine. Plastic is not the evil, poisonous monster some people make it out to be. The plastic used for essix retainers is safe to be in your body and does not leak chemicals into your mouth. If it did, it would not be legal.