There are many kinds of diseases that may cause uncomfortable sensations in the teeth, and the common ones are as follows: First, the teeth become food-embedded. When the food is embedded in the gap of the teeth, there will be swelling and pain of the gums. The second kind, tooth decay. When the caries develops to medium and deep caries, there will be obvious pain of eating sweet food and pain of food embedding. The third kind of tooth pulpitis, there will be obvious spontaneous pain, hot and cold stimulation pain, night pain and radiating pain. The fourth type, periapical periodontitis, is characterized by significant biting pain and small localized fistulas in the gums. In the fifth case, gingivitis and periodontitis occur, the gums bleed easily, the roots of the teeth are exposed, and there is sensitivity to heat and cold as well as loosening of the teeth. In addition to this, there may be some tumors in the jawbone that cause pain in the teeth.