There are three kinds of people who are prone to tartar: first, people whose saliva is alkaline, because everyone’s constitution is not the same, there are some patients who do not have any bad habits, but are prone to tartar, basically because they inherited alkaline saliva from their parents, and they may know that their parents have serious periodontitis if they ask. Second, people who like to smoke, because the smoke will stimulate the gums to appear inflammation and congestion, gradually will lead to the tooth surface is not smooth, easy to accumulate dental stains and plaque, over time will form tartar. Third, people with poor oral hygiene and environmental protection, because every time they brush their teeth incompletely, too much food accumulates on the surface of the teeth, and there is no way to get rid of it in time, it will mineralize and become tartar.