A tooth that has on-going pain may be a sign of a serious dental problem, such as tooth decay. Tooth Decay, also known as a cavity, occurs when bacteria living in your mouth produce acids that eat away at your tooth enamel. If left untreated, the severity of a cavity can result in tooth loss. Tooth pain is caused by a reaction of the nerves inside a tooth. However, a cavity isn’t the only dental issue that can bring on the pain. Tooth Sensitivity – A sharp pain near a tooth when you drink or bite into something that is hot or cold is known as having tooth sensitivity. The cause can be from a small area of decay in a tooth, a loose filling or an exposed root surface resulting from gum recession. Cracked Tooth – Feeling a sharp pain when biting down on food could be a sign of a cracked tooth and should be evaluated and treated by a dentist before the tooth breaks. Bleeding Gums – This could simply be a sign of brushing too hard. However, if your gums are also red...