Some say toothache is one of the worst pains to deal with. Teeth can become sensitive or painful for a number of reasons.
Occasionally overbrushing, toothwear or gums receding can cause teeth to be sensitive where some of the outer aspect of the tooth has been worn away or the root of the tooth has become exposed. Often this can be dealt with at home with sensitive toothpastes but needs checking with your dentist first to check whether there is a deeper underlying problem.
Most commonly dental pain occurs due to decay in the tooth or if tooth breaks. Hot, cold & sweet foods and drinks can then stimulate the nerve of the tooth bringing on the feeling of pain. Similarly, if there is a crack in the tooth, the two separate aspects of the tooth can flex causing a sharp shooting pain.
Another reason for dental pain is if the tooth dies. Sometimes, the tooth can remain in this state dormant or the tooth can develop an infection. When an infection develops, the pus produced will try and find the easiest route out. Commonly this infection appears as a gum boil next to the tooth in question, although occasionally the infection can spread to other areas such as the sinus causing problems like sinusitis.