It needs some attention and care
A toothache is pain that occurs in or around a tooth. The pain usually comes from within a tooth or the surrounding gum and bone structures. The pain can be from more than one tooth. Toothache pain is usually felt as a constant or intermittent ache that does not go away. A toothache can be stimulated by temperature changes such as exposure to cold drinks or pressure on the tooth while chewing. In other instances, a tooth can arise spontaneously without any stimulation.
It's hard to ignore a bothersome aching tooth while eating or going about one's day. While a toothache is bothersome, it is a way for the offending tooth or area to make one aware that it needs some attention and care.
What causes a toothache?
Toothaches are usually caused by injury or trauma to the tooth. Injury is commonly a result of dental decay (or "cavity"). A cavity is usually felt when it gets larger and deeper into the layers of tooth structure. The hard outer layer of tooth is called enamel, and the softer layer beneath enamel is called dentin. Dentin is sensitive with tiny microscopic tubes that run from the very center of the tooth. The center of the tooth is called the pulp chamber and contains the pulp. The pulp is comprised of blood vessels and nerves. If decay gets past enamel into the dentin, the cavity can sometimes cause discomfort. A deeper cavity that approaches the center of the tooth will likely cause pain since there is more damage to the tooth and there is less tooth structure to insulate and protect the pulp. Localized infection between the gum and tooth (periodontal abscess) can cause toothache. A traumatic physical blow to a tooth can induce a toothache as well.