Hi Bex, everytime i walk into a dental office mercury free or not i get ill for weeks. Even if it is mercury free, there must still be vapours. Like yourself i am so sensetive to it. Last year i had 3 teeth pulled out at a mercury free practice and became severly ill and suicidal afterwards, it lasted weeks and as i have had to keep going back for treatment i cant seem to get better. I am totally relying on Algin, its my lifesaver. .