What is Tooth Sensitivity?
Tooth sensitivity affects a number of people. It is often caused by eating or drinking something hot, cold, sweet or acidic. Under normal conditions, the underlying dentine of the tooth (the layer that immediately surrounds the nerve) is covered by the enamel in the tooth crown, and the gums that surround the tooth. Over time, the enamel covering can get thinner, thus providing less protection. The gums can also recede over time, exposing the underlying root surface dentine.
The dentine contains a large number of pores or tubes that run from the outside of the tooth to the nerve in the centre. When the dentin is exposed, these tubes can be stimulated by changes in temperature or certain foods. Here is an image of what the dentin tubes look like under the microscope: