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- The layer of the tooth under the enamel is called "dentin"
- Microscopic tubules act like tiny straws located in the dentin. They contain fluid and nerve endings
- Dentin can be exposed as gum tissue recedes or when the enamel is worn away—often by aggressive tooth brushing
- When stimuli, such as hot and cold foods and beverages, reach the exposed dentin, they cause the fluid in the dentinal tubules to move rapidly outward, resulting in sensitive teeth pain
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