The most common causes of sensitive teeth are cavities or tooth decay.

But here are 5 reasons that you may not know about.

1. Grinding or clenching your teeth.
2. Drinking acidic beverages like soda or lemonade, which to erode enamel.
3. Using a hard-bristled toothbrush or brushing with a heavy hand. Either of these also tends to wear away enamel.
4. Receding gum line, which exposes the root surfaces of teeth.
5. Fractured or cracked teeth.