hi Anita,
i did a quick web search and one of the phoo's that i saw look like 2 white spots under my tounge i had about 4 months ago. my ENT was agressive and immediately cut them out and sent for biopsy - which came back negative. my tounge was fairly sore for a few days.
at the time, i probably was over using my flouride toothpaste. i've since reduced usage. i hadn't heard of the connection between leukoplakia and flouride. so it was interesting for me to read that link in your post.
i hope your husband heals and doesn't need further treatment.
cu,
larryb