my teeth are much more sensitive as well. i think it is fluoride and mercury in the teeth. long after i cut out all fluoride, i had one tooth simply crumble, it was so brittle and weak from fluorosis. it just broke off to the gum line. it must have been dead because it never hurt. i have a tooth now that acts like its cracked. very temperature sensitive and sensitive to sweets and acids and electrolytes. even breathing in quickly through the mouth can do it. most sensations have become stronger, clearer, more defined, better detail, and much more interesting.