The more common cause of tooth flesh swelling and pain is too much calculus, mostly related to the usual poor hygiene habits, may be not adhere to the daily morning and evening brush on time, or may be too short to brush the teeth, can not be well cleaned teeth. It is also possible that after brushing your teeth at night, you have the habit of eating before going to bed, which leads to a large amount of food residue remaining in your mouth. The food residue and soft scale will become hard calculus after a period of calcification and attach to the gap between your teeth and gums, and some of the calculus will grow below the gums, which will stimulate your gums and cause swelling and pain. If there are wisdom teeth in the mouth, the blocked wisdom teeth will form deep blind pockets with the gums, and the blind pockets are prone to accumulation of food debris, which will breed bacteria and corrode the teeth causing wisdom tooth swelling and pain.