Experiencing hot and cold sensations in your teeth is a common sign of tooth sensitivity, often caused by enamel erosion, cavities, gum recession, or exposed tooth roots. When enamel wears down due to aggressive brushing, acidic foods, or teeth grinding, the underlying dentin becomes exposed, making teeth more sensitive to temperature changes. Other causes include worn fillings, crack... https://toothandgumclinic.com/blogs/reasons-for-hot-and-cold-sensations-in-your-teeth/