I was told recently that I have receding gums on the right side of my mouth & also starting in another area. The dentist told me that he will watch it. But if it doesn't get better within a certain timeframe he wants to do a procedure - taking skin from the roof my my mouth & transfering it to where the gum is receding.

I have read this is a symptom of mercury poisoning. Will it get better over time or will I have to do something about it?

Thanks!