White pus flowing out of the gums may be caused by periodontal abscess, wisdom tooth pericoronitis and other diseases, as follows. 1. Periodontal abscess: for the development of periodontitis to the late stage of concomitant lesions, the gums are red and edema, the surface is bright, the affected teeth can be loosened and floating feeling, the surface of the abscess is softer, gently pressure on the gums can be pus overflow, and the gums can be overflowing, the gums can be overflowing. 2. Wisdom tooth pericoronitis: Inflammation of the soft tissues around the crown of the tooth when the wisdom tooth erupts incompletely, manifested as redness and swelling of the soft tissues and gums around the wisdom tooth, with obvious tenderness. After purulent inflammation is confined, a pericoronal abscess may form, and pus overflows after it breaks out on its own. There may be other reasons for the white pus coming out of the gums, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease for targeted treatment.