According to Cutler people will see initial improvement after removal. Then get worse for a few months. I think the 6 month worsening is missunderstood. Cutler says people will feel better for 2-3 months, then worse (organs dropping mercury in the bloodstream) and worst 6 months after removal. He doesn't say that you will suddenly have mercury symptoms 6 months after removal.

I bought cutlers book 1 month after I had my amalgams removed. I felt very good in this period and I when I read about this I could not believe that this would happen to me.
But it did. 3 months later I felt worse than ever. I am 6 months past removal and slowly recovering now.

I had an immediate improvement after removal, not 100%, but still very impressive. (my dentist did not look for vapor under my teeth.)

I think that some people can improve and get rid of symptoms 100% without chelation. Cutlers protocol is for people that are seriously toxic in my opinion.

As far as I know El Essawy says, that people will need 6-12 months to get rid of their mercury symptoms. Cutler says 1 year to feel better but you will never be 100% cured without chelation.