1, open your mouth in the mirror and observe whether there is any food stuffed in the gap between your teeth and whether there is yellow tartar on your teeth. 2, to see whether the teeth have caries, black spots, calculus and color pigmentation. 3. Tap the upper and lower teeth, or use a toothbrush to help observe whether the teeth are all stable and not loose. 4, feel each tooth with the tip of the tongue, check whether there are missing, crooked, loose, sore and other problems. 5.Check the mouth for ulcers, odor or inexplicable swelling. 6, observe the color of the gums to see if they are normal pink, with or without signs of redness and swelling. 7, eat hot, cold, sour, sweet and other stimulating foods and use cold water to brush your teeth, the teeth have no acid, pain, soft feeling, or bleeding phenomenon. 8, swallow a mouthful of saliva, and then wait 30 seconds to feel whether the saliva secretion in the mouth is sufficient, and whether there is a sense of dryness. If your answers to the above items are positive, then it means that your teeth are very healthy. If more than 2 items are not up to standard, then you need to pay attention to oral cleaning, and if 3 items are not up to standard then you need to seek medical help. Four dental advice 1, and your dentist regular “appointments” Frequent dental checkups, prevention, do not wait until the teeth hurt, have problems and then think about how to treat. For example, every year to clean the teeth, in the children’s teeth with the children to check a few more times, timely detection of problems in time to solve, can help you save a lot of money and time. 2, learn to choose a toothbrush According to the different sizes of adult, pediatric and toddler mouths, China’s toothbrush standards specify the size of the brush head. Adult toothbrushes are larger, pediatric toothbrushes are smaller, and toddler toothbrushes are the smallest. The maximum length of the bristles bristle surface does not exceed 42 millimeters, the height of the bristles does not exceed 13 millimeters, and the diameter of the brush filament is between 0.2 and 0.3 millimeters. Buy a toothbrush as long as attention to see, you can buy the right size. 3, toothpaste preferred “common type” toothpaste is a toothbrush aids, with abrasive effect and remove plaque, clean and polish the surface of the teeth, so that the oral cavity refreshing effect. Toothpaste is divided into general toothpaste, fluoride toothpaste and drug toothpaste three categories. If your teeth are in good health, you can choose regular toothpaste. Free dental recruitment network to organize fluoride toothpaste can prevent caries, but note that the national regulations, fluoride toothpaste free fluoride should be between 400 ~ 1200Pm, which is safe for the human body, and children before the age of 4 years should not be used. Drug toothpaste will have a certain inhibitory effect on the growth of pathogenic bacteria and non-pathogenic bacteria, but should not be used for a long time, so it is recommended that several kinds of toothpaste for use. 4, the proper use of mouthwash If you do not have periodontal disease and oral problems, rinse your mouth with warm water and occasionally use non-alcoholic mouthwash. Because the mouthwash itself, although the cleaning power, mainly play the role of removing the odor, so when there is a special need to use occasionally, it can be.