Acid pouring teeth is mainly a symptom of tooth allergy caused by various reasons, mainly seen in the following cases: 1, the environment in the mouth is mainly acidic, if you eat too acidic food, such as lemon, vinegar, hawthorn, etc., the acid penetrates from the enamel to the dentin, because the dentin has the peripheral nerve of the pulp, so there will be sour teeth, you can rinse your mouth with baking soda or brush your teeth with anti-allergic toothpaste Can be alleviated; 2, bad brushing habits lead to, if too old, toothbrush bristles are too hard, brushing too hard, brushing teeth horizontally, etc., over time will lead to wedge-shaped defects in the teeth, resulting in dentin exposure, eat cold, hot, sweet, sour food will appear acidic inverted teeth symptoms. First of all, we should improve the brushing habits, use soft bristle pulp, the defect can go to the hospital with resin filling; 3, the tooth hidden crack caused by a bad bite relationship, mainly due to the upper and lower teeth bite too much force damage teeth, so that the tooth fissures, easy to be stimulated by the outside world, if the tooth sensitivity is obvious, you can do the crown protection.