There's something that helps heal cut mouths quickly but its not vaseline or sudocream, I just can't remember the name of it, so if anyone knows what it might be called that would be great thanks.
A bandage wrapped around a bit and then soaked in alum solution. The horse can then be stood in his bridle for 20 mins at a time with the solution in contact with his sore bit. That's what we always used to use for the showjumpers when I groomed years ago. Was very effective.