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Just to be clear, There is a difference between pain and sensitivity. Pain is when your teeth hurt, like when you fall down and your knee/elbow hurt. Sensitive is a tingling sensation. It is present only when there is exposure to cold, hot, sour or initial disease. You might be facing sensitivity issues here like the others have mentioned.
Sensitivity. Sensitivity can occur when the underlying layer of your teeth becomes exposed as a result of receding gum tissue. The roots of your teeth, which are not covered by protective hard enamel, contain thousands of tiny tubules leading to the tooth's nerve center (the pulp).When exposed, these tubules allow stimuli â such as hot or cold food â to stimulate the nerve in your tooth, causing the pain you feel.he roots of your teeth, which are not covered by protective hard enamel, contain thousands of tiny tubules leading to the tooth's nerve center (the pulp). When exposed, these tubules allow stimuli â such as hot or cold food â to stimulate the nerve in your tooth, causing the pain you feel.