Why does tooth sensitivity occur?
Many adults experience tooth sensitivity, also referred to as dentine hypersensitivity. Most people experience tooth sensitivity as a short, sharp pain originating from a tooth or teeth in their mouth.
What causes tooth sensitivity?
Each tooth contains four parts.
- The enamel comprises the visible crown of the tooth and is the hardest layer of the tooth containing the highest level of calcium phosphate mineral.
- The dentine is the layer below the enamel in the crown of the tooth, and below the cementum in the root. It is softer than the enamel, but stronger than the cementum.
- The cementum is present on the root surface to help anchor the teeth into the jaw.
- The pulp is in the center of the tooth and contains soft connective tissue, blood vessels, and nerves.
Major factors that lead to tooth sensitivity are gum recession and loss of cementum, and loss of enamel.
Gum recession (gum moving down from the gum line, exposing the root dentine surface) can be caused by loss of periodontal attachment as a result of periodontal disease or by brushing too hard causing gum abrasion.
Loss of enamel, on the other hand, can occur when the toothbrush abrades or wears down the enamel surface and exposes the underlying dentine (the layer underneath the enamel). Enamel loss is more prominent when brushing occurs immediately before or soon after consumption of acidic foods (fruits, tomatoes) and drinks that cause tooth erosion.
What happens in the tooth to cause tooth sensitivity pain?
When the enamel is worn down, or the gum line has receded and exposed the dentine, tooth sensitivity pain can occur. The dentine contains tubules that run from the centre of the tooth, i.e. the pulp, which contains the nerves of the tooth, to the exposed dentine surface. When the dentine is exposed, dentine fluid flows outward from the pulp. If this flow is perturbed by exposure to an external stimulus, such as heat, cold, change in pressure, sweet or sour foods and drinks, a signal is transmitted to the nerves, which is perceived as pain.
If you think you are experiencing tooth sensitivity pain, it is recommended that you see your dentist who can correctly diagnose why you are experiencing tooth sensitivity pain and provide a solution.
This page/article is intended to promote understanding of and knowledge about general oral health topics. It is not intended to be a substitute for professional advice, diagnosis or treatment. Always seek the advice of your dentist or other qualified healthcare provider with any questions you may have regarding a medical condition or treatment. Always read the label. Follow the directions for use. If symptoms persist, talk to your health professional.