Teeth are often sensitive due to damaged enamel, exposing the sensitive dentin layer beneath. This can be caused by several factors:
– Long-term use of over-the-counter mouthwash or drinking acidic beverages can erode the protective enamel.
– Teeth grinding, tooth decay, old damaged fillings and brushing your teeth too hard can all damage the enamel layer.
– Receding gums, caused by gum disease, exposes the dentin thereby causing sensitivity.
Sensitivity can also occur when you get a crown or a professional cleaning, but that is only temporary and should disappear very quickly.