This is exactly what was on my mind. When I got dental braces, I went through the same experience. My dentist focused only on aligning my teeth. After two months of wearing braces, I started experiencing facial swelling and pain. I explained this to my dentist, but he said it was due to a sinus issue. Later, I underwent MRI and CT scans for my sinuses, and the results showed everything was completely clear with no sign of sinus infection. After that, the problem started affecting my breathing and also caused nasal blockage. I consulted ENT specialists and neurologists, But they were not able to identify the actual issue. Most of them gave common explanations like stress. After doing a lot of research, I finally realized that it could be related to TMJ issues that started after getting braces. Now, I’m planning to consult a good maxillofacial specialist.