> The two subjects on SAD have had cavities/ gum/ dental problems despite a
 > strict and thorough brushing/ flossing regimen.

I have gum problems and things got worse when a dental hygienist did a deep
cleaning of the teeth, she went under the gums and they never healed since .
I have the feeling too that brushing my teeths are agravating the problem by
disturbing the gums .
jean-claude