Tooth decay occurs when plaque builds up because of the food particles like bread candy and fruits etc. are left on the teeth. Bacteria in the mouth after eating these foods form acid. Food debris, bacteria acid and saliva together form plaque. Plaque that clings to the teeth erodes tooth enamel and creates hole in the teeth which is known as cavity or carries. Tooth decay can cause unbearable pain especially when foods particle get stuck in the tooth. Tooth decay can even lead to tooth infection and eventually tooth loss, if not treated early. You need to get them filled by a dentist. Till the time you see a dentist there are several home remedies that bring relief from toothache.