I've noticed my horse has two white lines on her face, one on either side. They're about an inch long, and by her lips...like if she had a bit in her mouth pulling back on her lips, that's where the white lines are. They're an inch or two long. Could these be from having a bit ripped around in her mouth with a lot of pressure? She's only two still, but I know she had people on her back, including some young kids, before I bought her. This is part of the reason I'm reluctant to use a bit on her. She's not headshy at all, and doesn't seem sensitive in that area, but could this be a possibility?
That's part of the reason I'm interested in a bitless bridle.