I get these reports of an tooth extraction site being sensitive to cold or air after an extraction and almost always it’s the adjacent tooth, and I suspect that’s what is happening in your case. Sometimes extractions will cause the root of an adjacent tooth to become exposed and that tooth with the exposed root will become sensitive. Sensitivity to cold wouldn’t be much concern especially if it’s mild, but sensitivity to heat could potentially be a serious problem in that tooth. I’d have it checked.
When a tooth becomes irritated, it will often become sensitive to cold. If that irritation persists without getting resolved, the tooth can become sensitive to heat. That happens when the pulp tissue inside the tooth begins to die. In the process of dying, it gives off gasses. Heat causes those gasses to want to expand, but since they’re confined inside the tooth, there is no where to expand and that causes pain.
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