Huh! Very cool, thanks guys! This horse was more or less feral so I doubt she ever had a bit on, though that's cool to know too, about severe bit misuse causing changes/damage to the bones. That's another neat thing about this particular skull, she was in fact a she, despite the very impressive canines. Now to just figure out if the tooth infection changes her value, might be a neat addition for someone or might decrease value for 'damages'. She's in flawless condition otherwise, not a single missing tooth etc.
I'm also kind of wondering if I took that tooth out if there would be actual changes to the root of the tooth and the inside of the socket too..hmm. Now to decide if it's worth it to take it out or not!
Anyway, once again thanks for the info and help, guys! It's much appreciated, not knowing what that is has been driving me crazy. I kinda feel sorry for her, I bet that wasn't pleasant to live with during life.