1, gobble apples. Dr. John Buzzatto, president of the American Association of Orthodontists, says try to avoid directly chewing hard and crunchy fruits and vegetables such as apples and carrots with your teeth, which are the biggest culprits causing dental fissures. These foods can be eaten in small pieces. Similarly, chewing ice cubes can also lead to tooth fracture. 2, chewing corn. Dr. Buzzato said that chewing corn can easily lead to loose or lost teeth, and can also cause dentures to shift. It is recommended to peel off the corn kernels before eating. 3, do not rinse your mouth after eating pasta. Bread and other refined pasta will make the mouth acidic surge, corrosion of tooth enamel, but also easy to remain in the gap between the teeth. So eat noodles after careful rinse mouth. 4, tear packaging with teeth. Some people want to convenience, tear the package with teeth, open the cap, etc., it is easy to break or displace the teeth, the package of germs will silently enter the mouth, affecting human health. 5, always drink bottled water. Georgia dental expert Dr. Brett Silverman said that bottled water in the purification process, the acidity will be enhanced, easy to cause tooth decay. Some pure water lacks essential minerals for teeth, and drinking it often is also harmful to dental health. In addition, most sodas and sports drinks also contain acids, which can erode tooth enamel. It is recommended to drink boiled tap water or use straw to reduce the chance of contact between drinks and teeth, which also has a certain preventive effect. 6, love to eat potato chips and dried fruit. Potato chips and popcorn are brittle and sticky in the process of chewing, so they are easy to be stuffed in the teeth, breeding bacteria and leading to tooth decay; some dried fruits, such as raisins, figs and dried apricots are rich in nutrition, but they also contain a lot of sugar and fiber, which are easy to increase the residual amount of sugar around the teeth. 7, often drink black tea and wine. Tooth enamel is particularly susceptible to dark foods (such as dashi, soy sauce, ketchup, curry, etc.), the impact of subtle spots. Dr. Michael Paesani, a dental specialist in Virginia, USA, suggests that you should drink more water when eating such foods and rinse your mouth more after eating. In addition, some drinks also tend to cause tooth discoloration. Dr. Erwin Smigel, president of the American Cosmetic Dentistry Association, said that white wine is highly acidic, will make teeth more easily colored, alcohol will also lead to oral dryness, reducing the protective effect of saliva on teeth; black tea in the tannic acid will also increase the risk of tooth coloring, it is recommended that people who often drink such drinks choose whitening toothpaste, or drink green tea and herbal tea instead. 8, love to eat acid. Citrus fruits (such as grapefruit, orange and tangerine, etc.) contain a lot of acid, which is not good for dental health, so you should drink water or rinse your mouth in time after eating. Vinegar is also easy to induce tooth decay, research found that children who eat too much vinegar, the risk of tooth enamel corrosion will increase by 30%-85%. Eat more lettuce can reduce the harm of vinegar to teeth. 9.Chew gum all day long. Dr. Bill Dorfman, an American dental expert, said that chewing gum all day is the same as letting your teeth soak in sugar water, it is recommended to choose sugar-free gum or xylitol chewing gum. In addition, the United States Massachusetts dental specialist Dr. Guilonm Lepine said that gum is easy to stick to the teeth, the formation of plaque; always contain hard candy or lozenges, the same is not conducive to dental health.