Tartar on the teeth may be food debris or tartar from calcified saliva, or staining of the teeth. Tartar on teeth, also known as soft tartar, is mainly food residue after eating, such as eating cookies or sticky food, which is not removed by timely brushing, and mixed with shed epithelial cells, or plaque, etc., which forms soft tartar over time. Tartar is formed by the calcification of saliva and clings to the surface of the teeth, which is difficult to remove by brushing. Ultrasonic shock is required to remove it, also known as scaling. Tartar on teeth is also related to the state of development of the teeth themselves. If there is a lack of calcium during the calcification period of the teeth, that is, during the fetal period, it may lead to the underdevelopment of enamel, and the surface of the teeth will have rough and uneven depressions, which may lead to the accumulation of tartar, or if it is an acquired factor, it may be related to the preference for sweets or acidic food. Tartar on the teeth may also be due to tobacco stains or exogenous staining of the teeth. Smoking tends to form plaque on the surface of the teeth, and eating colored foods, such as chocolate or coffee, and strong tea, can lead to staining of the teeth and tartar. Therefore, tartar on the teeth may be tartar, or tobacco plaque and tooth staining.