Teeth are very important human organs, not only do they chew food and help with pronunciation, but they also have a great impact on facial contours. Its role is to help us humans to eat, chew food, and better help the digestion and absorption of the stomach and intestines. Most people damage their teeth due to long term bad habits, and often see a lot of people using their teeth very incorrectly, do you really know how to protect your teeth? Below I will point out a few practices that damage the teeth. 1, often whitening teeth: teeth whitening is through a chemical agent to achieve the effect of whitening, this whitening agent is corrosive effect, but only corrosive surface a very thin layer, so occasionally whitening is possible, but excessive bleaching teeth will make the enamel weak, acidic substances are more likely to corrode the teeth, resulting in damage to the enamel hole. Once the enamel is injured it will not be able to recover and will easily lead to the exposure of the tooth nerve and pain. In fact, there is no need to pursue particularly white teeth, the original color of the teeth is not white, but yellowish, the natural color is the most beautiful. 2, eat too acidic: many people like to eat acidic food, acidic food can be eaten, but a large amount of acidic food can not be, have seen a person eating dumplings drank half a bottle of vinegar, this practice is extremely undesirable, in order to protect teeth, should avoid drinking a lot of soda, orange juice, red wine, or eat lemon and other acidic food. The reason is that acidic food eaten in excess also damage tooth enamel. 3, hot and cold alternately: thermal expansion and contraction, when consuming food that is too hot will lead to tooth enamel expansion. If you drink cold drinks at this time, it will lead to the sudden shrinkage of tooth enamel in cold and produce hair-like cracks, which will make you easy to suffer from tooth decay after a long time. So it is recommended that everyone, develop good eating habits. 4.Pull saw type brushing: brushing too hard will intensify the wear of tooth surface enamel and cause tooth allergy and pulp exposure. It is recommended to choose a soft-bristled toothbrush and take the action of drawing a circle, avoiding the pull-saw type of hard and violent brushing. In addition, if a toothbrush has bent bristles after 2 to 3 months of use, it is a clear sign of excessive brushing force. 5, teeth as a tool. Many people are used to using their teeth to open beer bottles or tear open bags, etc. Teeth are used to chew food, not bottle opener and other tools, often do so is very easy to lead to tooth breakage, displacement, etc.. Including the use of teeth to crush nuts, this is highly discouraged. “Melon teeth” is a typical example. 6, brushing time is short: many people brush their teeth only once a day, each brush is also haphazard. Too short a brushing time, too little times, and sloppy brushing will greatly increase the risk of dental plaque and dental caries. It is recommended to brush your teeth at least twice a day, and each time should brush enough for 3 minutes. Also, floss at least once a day to clean the gaps between your teeth. Toothbrush can only remove plaque on the surface of teeth, but flossing can remove bacteria and food debris between teeth, so toothbrush with flossing is the best way to clean your mouth everyday. There are many other practices that damage teeth in daily life, although I have only mentioned 6 points, but we must remember that teeth need to be protected every day. I hope you all have a healthy, straight, beautiful teeth.