I don’t think braces can cause serious injury. They may probably cause very minor injury like cuts to your lip or scratches inside your inner cheeks, but nothing serious. You should expect some pain or discomfort for a few days. That is normal.
The teeth should be sore for a few days. That’s normal. If they don’t hurt, that means they’re not moving. If they’re hurting more than a week, you should go back to your orthodontist and have them adjusted.
This link will explain your concern:
Hope this will help,
There is only one sign of “early” gum disease, and that is
Bleeding gums. If ignored, gums would start to get
Swollen we call “gingivitis”, and that would be the start of gum disease.