I don't have advice, but I have been reading up on a new diagnostic tool that Jerry Wilck has mentioned numerous times: the Velscope. It is a device that uses light to diagnose early problem areas even before they are visible to the eye, because of the different ways the problem tissue responds to the light. A person like your husband, who seems to have a propensity for such lesions would really benefit from routine Velscope examinations. You can call or email the company and find out where the closest practitioner is to you. I called and found that the closest one to me is in Houston. I haven't been yet, but if I had a recurring problem like yours, I think I would look into it. Good luck! I know that Jerry has bought one for his dental practice, so he can answer questions about it.