There are many causes of sensitive teeth, the most common are:

• Dental decay
• Gum disease exposing the exposed root surface of the teeth
• Dental erosion
• Cracked tooth
• Scrubbing too hard, a toothbrush that is too hard, or using whitening toothpaste.

The most common solution is to switch to using a sensitive toothpaste, and also a soft or ultra-soft brush. Because tooth sensitivity can indicate dental disease it’s always a good idea to consult with your dentist to make sure you don’t have an underlying dental problem causing the sensitivity.