Here are some pics. If you notice, his lower right jaw is a bit 'dented' I'd say. But no visible bleeding/sore whatsoever. Maybe he lost a fang after striking the enclosure top?
Could it possibly it could get worse? I just cleaned his enclosure entirely, changed substrate, cleaned his hide out and water bowl just to make everything as hygienic as possible. I even bathed him a short while with warm water just to ensure no poo or urine is on his body.
Other than that, he looks healthy, very curious and had a good stroll on my carpet while I'm cleaning his enclosure

I've read about the mouth rot thingy and is worried about it.
Anything I can do to make things better? I plan to wait for a few days to see how he's doing before taking him to the vet if necessary.

Thank you all for the advice and tips.