Wisdom teeth are usually painless when they grow in, but if they are combined with pericoronitis, there may be pain or even swelling. If there is enough space for the wisdom teeth to erupt, you will not feel anything. However, in most cases, there is not enough space for wisdom teeth to erupt, the teeth cannot erupt normally, and some of them are covered by the gums. If the oral hygiene is not good, the gums will be red and swollen due to the stimulation of food debris or soft tartar, and the bacteria will breed and trigger the wisdom tooth pericoronitis. Gums red, swollen and overflowing pus, and in severe cases can also lead to interstitial infection, facial swelling and even limited opening of the mouth. Therefore, there is enough space in the wisdom tooth eruption process is not painful, wisdom tooth obstruction combined with pericoronitis will be painful, you can go to the dentist for medical treatment.