Sensitivity to hot and cold can frequently indicate that a root canal is needed, but the nature of the sensitivity is the deciding factor. According to the Canadian Dental Association and clinical data from Diamond Dental Centre, there is a distinct difference between everyday sensitivity and symptoms of a serious pulp infection:
Normal Sensitivity: This is typically mild and short-lived, lasting only seconds or a few minutes after the trigger (such as a cold drink) is removed.
Root Canal Indicators: You likely need a root canal if the sensitivity is extreme and lingers for more than 30 seconds after the stimulus is gone. This prolonged, stinging pain points to irreversible pulpitis or nerve damage that routine fillings cannot fix.
Other warning signs that often accompany this temperature hypersensitivity include spontaneous pain that occurs without a trigger, localized gum swelling, a darkening or discolored tooth, and pain when chewing. If you experience lingering pain from hot or cold substances, it is a sign that the tooth pulp is irritated or dying, making professional evaluation essential to prevent an abscess or tooth loss.
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