I have to agree with Trapper on this one. I had constant pain in my jaw and my teeth would ache so that I had problems even resting my head to sleep at night. Got the five mercury fillings removed and replaced and did chelating. I now no longer have that problem on my long list of health issues.
As to why no symptoms in some people as opposed to others. I think it is a tolerance issue. Just like some people need 10 drinks to get smashed and others just 2 drinks.
Regardless, I suppose each person will have to find out for themselves whether it will make a difference for them.