Teeth remain unclean and dirty on account of not cleaning them daily resulting in the growth of bacteria in the roots of teeth. This process leads to mouth stench, weakening and shaking of teeth along with aching and also sensitivity to cold or heat grinding of teeth enamel takes place on the part of those people who eat beetles and gutka in excess. Consequently, the nerve-related parts of the teeth come nearer, and soon they begin to ache. They also get sensitive to cold and hot water.