Teenage periodontitis is characterized by: 1, the number of dental calculus is less, the gum inflammation is heavier, the lip side of the gums show obvious swelling, hyperplasia, sometimes bulbous protuberance, the color is dark red, easy to bleed; 2, adolescents are in the period of alternation between the milk and permanent teeth, the alignment of the teeth is not aligned, accompanied by bad habits such as mouth breathing, teeth are not easy to clean, if you can’t maintain good hygiene habits, it will result in the stagnation of plaque, caused by the aggravation of gingivitis; 3, after puberty, the gingival inflammation can partly subside on its own, through the ultrasonic scalpings to remove the plaque, tartar, with the periodontal rinsing, with rinse and so on, can be eradicated periodontitis of adolescents.