Tooth decay often causes toothache or tooth sensitivity. Not only does this often leave one grumpy and irritable, it also affects the ability to properly chew the food, which in turn inhibits digestion. Besides making it more difficult for the body to absorb important nutrients, poor chewing habits can contribute to a host of related digestive problems and discomforts. Tooth decay can also cause discolouration of the teeth, which ruins the aesthetics of her smile and can lower her self-esteem and confidence. Left untreated, tooth decay can lead to further problems, such as abscesses and gum disease.