I recently got braces and I am a trombone player. That's my problem. Any solutions to lessen my pain or make my embouchure better with braces?

There is no problem there. You will need time for your lips to adjust. I have my students do this;
Start on low A and play chromatically up an octave and then back down. Move up to Bb and do the same thing; chromatically up an octave and back down. Continue moving up in half steps. Do this at least once a day, I like it if my students do it once in the morning and once in the evening. Your lips' skin and muscles will adjust quickly in two to four days.