If you have amalgam in your mouth, try this experiment (video below). Please let me know your results. Mine were astonishing. A true testimony to my vast amalgam.
Find something heavy, like a full paint can. Something you can lift with one hand, but not too easily. If you have a roll of cotton, put it inside your mouth on one side, over your worst amalgam area, and bite just firmly enough to hold it in place (I just used my tongue since I didn't have the cotton).
Life the paint can outward and up towards your head with one hand, on the same side of your body as the cottoned amalgam. Lift as high as you can and hold that position momentarily to measure your strength. Now take the cotton away, bite and click your teeth several times, making sure you click on that same amalgam. I could not even fully lift the paint can after doing this, it required SIGNIFICANTLY more effort.