Toothbrush at least three months to replace, if the replacement time, toothbrush bristles did not bend, tilt, may be your usual brushing force is too light, or the number of brushing too little. You should brush your teeth once in the morning and once in the evening, for 3 minutes each time, with appropriate strength. In addition, there is a kind of toothbrush on the market will “fade”, to a certain extent, the color on the bristles will gradually recede, to remind people that it is time to change the toothbrush, to play the role of “supervision”. Five situations tell you that the teeth are not brushed right 1, toothpaste with fast: toothpaste squeeze too much toothpaste is usually used to do friction agent calcium oxide. Calcium oxide is irregularly rhombus-shaped, so if you brush your teeth with too much toothpaste, over time will cause a certain (damage to the teeth. Generally toothpaste only needs to take the size of a soybean. There is another situation is the whole family together with a tube of toothpaste, which will increase the chances of cross-infection of the whole family oral cavity, should be a tube of toothpaste per person, it is best to buy a small tube. 2, after brushing and eating toothache: mouthwash temperature is too low After brushing teeth feel sore teeth, eating to make the force, may be the mouthwash temperature is too low, the gums are cold stimulation become sensitive. It is recommended to rinse the mouth with warm water around 35℃, which can avoid stimulation and reduce the occurrence of pulp inflammation. 3, brush after the periodontal is not smooth: toothbrush is not 45 ° angle After brushing teeth with your tongue, if the teeth and gums junction is not smooth enough, or there is still tartar, it means that the angle of the toothbrush is not right, the bristles do not fully contact these places, toothbrush should be 45 ° angle with the teeth. 4, after brushing and breath: did not brush the tongue The food residue and bacteria on the tongue can cause bad breath. Therefore, excluding stomach and lung diseases and other reasons, if the breath is still there after brushing, it is probably because the tongue was not brushed. According to a study by the University of British Columbia, brushing your tongue while brushing your teeth can reduce bad breath by about 85%. When brushing the tongue, use a soft toothbrush and brush lightly from the root of the tongue to the tip of the tongue 7 to 10 times. 5, dry toothbrush brush easy to hurt the gums Most people brush their teeth, habitually dip the toothbrush wet first before squeezing toothpaste. And there are media reports, do not dip your teeth in water before brushing, then brush your teeth before dipping in water or not? In fact, you should wet your toothbrush before brushing your teeth. If you do not wet your toothbrush beforehand, the bristles will become very hard and easily damage your gums. In addition, many people struggle with whether to use a soft-bristled toothbrush or a hard-bristled toothbrush. The softness of the bristles of a toothbrush varies from person to person, for example, patients with periodontal disease need to choose a soft-bristled toothbrush, which is good for cleaning the periodontal zone. People without periodontal disease can choose a toothbrush with medium softness and small brush head. Toothbrushes are not recommended to use for too long, otherwise the bristles tend to accumulate bacteria, which is not conducive to oral health. There is also a view that because toothbrushes are often in a humid state, pathogens are prone to breeding and reproduction, two toothbrushes should be prepared and used alternately in the morning and evening. In fact, there is no need to force a toothbrush in the morning and evening, generally half a day after brushing the toothbrush will become dry, therefore, the morning and evening with a toothbrush, and can not reduce germs. It is better to disinfect the toothbrush often, you can go to the pharmacy to buy 3% hydrogen peroxide and soak the toothbrush regularly to disinfect.