Some people may find that a little black spot suddenly appears on the surface of their teeth, but they don’t feel any pain either. There are two possibilities if black spots appear on the teeth and it does not hurt. 1, pigmentation Such as tobacco stains, tea stains, coffee stains, etc., which are difficult to brush off and can be removed by teeth cleaning. 2.Deep or shallow tooth decay The tooth decay appears as a black spot from the outside, usually located in the sulcus (dotted or linear depression on the tooth surface). The culprit of tooth decay is certain bacteria in the mouth, but it takes time for them to destroy the tooth, from the initial discoloration to the final formation of cavity, usually takes 1.5 to 2 years. During this period, it is entirely possible to nip the decay in the bud if we pay more attention to our teeth. How can we detect this hidden tooth decay in time? Find a good dentist and check your teeth half yearly! Once the small black spots on the teeth are confirmed to be cavities, they should be repaired as early as possible to stop the development of the lesions. If you let it continue to develop, it will become obvious cavity, then the patient will be sensitive to food stimulation such as hot, cold, sour and sweet; when the damage further reaches the pulp (i.e. “dental nerve”), it will be unbearable pain and seriously affect the daily life. Clinically, we see many people wait until the toothache is too much to bear before they go to the hospital. At this time, usually can not rely on simple fillings to solve the problem, may also have to do root canal treatment or even extraction of the affected teeth, denture repair, time-consuming and expensive, people also suffer, can be called “small hole is not filled, big hole to eat suffering”. Therefore, you should pay attention to self-examination, observe the changes of tooth color, shape and texture, and have a comprehensive oral examination every six months, if there is tooth decay, you should find out and treat it early. Daily dental care tips ①, correct daily brushing method Brush your teeth for 10 minutes every day, 5 minutes each morning and evening. If possible, use dental floss to clean the gap between teeth after brushing. Visit a professional medical facility every six months to a year to clean your teeth, as there are some areas that cannot be reached by a toothbrush. ②, rinse your mouth after eating The acidity in the mouth will increase after eating, leading to tooth decay, and carbonated drinks will double the damage. After eating, you can use warm water or light tea to rinse your mouth to reduce the harm of food residue and bacteria erosion of teeth, or chew xylitol gum to increase saliva secretion through chewing action to neutralize the acidity of the mouth. ③, drink more water 70% of the human body is composed of water, drink more water not only to keep the body healthy, but also to stimulate saliva secretion, neutralize acidity, kill bacteria, improve the cleanliness of the mouth, to curb the growth of bacteria.