Concerns about orthodontic teeth whitening

It seems that my teeth and gums have become quite weak after orthodontic treatment about ten years ago.

Even if I diligently use interdental brushes and dental floss, I always feel strain because of the retention device, so it seems inevitable that it will weaken over time. ㅜㅠ

Even before orthodontic treatment, the tooth color was not particularly clean.

Lately, I've been drinking a lot of coffee, so I'm concerned about the color of my teeth.

I'm embarrassed to openly smile with my teeth showing anywhere ㅜㅠ

Have you tried teeth whitening if you have braces or weak gums?

I wonder if there was much stimulation.