I am having a pain in all the front teeth, upper and lower...but do not believe it is from grinding or clenching my teeth at night. I wear a guard and this is a different kind of pain. The pain is low-grade, like a sensitivity deep down in the teeth...many teeth, not just one or two (and on both sides of mouth, mostly in front teeth.). Is tooth sensitivity ever equated with a lack of calcium or an over-acidity in the saliva? Is there an essential nutrient or a vitamin/mineral that people get deficient in that might cause a sensitivity or pain to start in their teeth?