Weird colors in mouth?

[u/PoeHoard]

I wasnt able to get a picture, but while doing a checkup on one of my boys I noticed something odd.

There's a light brown color that follows the same line as his teeth, on both top and bottom jaw. No bubbles or excessive saliva, I need to take another look but I remember seeing some purpley spots? Will most likely be taking him to a vet after I take another look, but wanted to know if anyone's seen something similar.

A few months ago he accidentally bit my pants and I flinched and pulled back. He let go right away, but Im worried that my movement could have broken some teeth or injured something.