A layer of yellow milk on the teeth can be scraped off mostly considered as food residues mixed with bacteria and other soft tartar, which can gradually calcify to form calculus, and bacterial growth and reproduction can form plaque attached to the tooth surface and between the teeth, which can cause a series of oral diseases. There is a layer of yellow milk on the teeth can be scraped down mainly because the sticky food debris residue on the teeth after eating, not timely rinsing or brushing to remove, easy to cause the breeding of bacteria, gradually calcify to form plaque, after a long time of accumulation of gradually formed soft scale, teeth will appear a layer of yellow milk-like soft scale, can be scraped down. This soft tartar can usually be removed by brushing the teeth. Normally, you should pay attention to oral hygiene, do diligent brushing in the morning and evening, rinse your mouth after meals, and use dental floss and flosser to assist in removing food residue, which can also be used to remove soft scale. Regular dental scaling can also be used to help remove soft scale and keep the mouth clean. In addition, if soft tartar gradually calcifies and forms calculus, it is harder and will firmly adhere to the tooth surface and cannot be removed by brushing. Patients are advised to visit a professional hospital and may need to be removed by scaling or scraping, avoiding self-scraping which may cause damage and cause bleeding gums.