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為什麼有時牙齒遇冷遇熱會痛?正常牙髓對冷熱刺激耐受閾在20~50℃間。過高或過低都會引起不適。 當牙髓有病變時,其溫度耐受閾發生變化,對冷熱刺激可表現為敏感或遲鈍。所以當有深齲、牙本質過敏症、牙髓炎等疾病時牙齒遇冷遇熱會痛。