With the improvement of living standards, people are not only pursuing the beauty and cleanliness of their teeth, but the health of their teeth is also getting more and more attention. How to have a good healthy and fresh teeth? 1. Brush your teeth. Brush your teeth twice a day, morning and evening, 3-5 minutes a time, brush the head of the brush on the neck of the teeth, the hair bundle and the tooth surface at an angle of 45 degrees, the hair end toward the root tip, gently press the end of the hair bundle into the gingival sulcus 0.5-1mm, part of the sulcus outside and into the adjacent surface. The toothbrush is shaken 4-5 times horizontally in the in situ direction, so that the plaque near the gingival margin and the adjacent surface can be broken up and removed from the tooth surface. When brushing the lingual surfaces of the upper and lower anterior teeth, hold the head of the toothbrush upright and use the front part of the brush head to contact the tooth surface near the gingival margin for upward and downward movements. Move the toothbrush in sequence to the adjacent teeth and repeat the same action. Remember to brush the buccal surface and do not leave out the lingual and occlusal surfaces. Do not brush with more than 200 g. Do not brush long distances across the teeth, but brush one tooth at a time. 2.Cleaning The high-frequency vibration of ultrasonic waves removes calculus from the teeth and prevents gum bleeding or tooth loosening. If the teeth become loose after scaling, it is because the gums are stimulated by the inflammation of bacteria and toxins in the tartar for a long time, the gums shrink and the alveolar bone is absorbed. 3, flossing Choose flossing is a good method. First, knot the floss into a ring, or wrap the two ends of the floss around two middle fingers, press the floss into the gap with two thumbs, and gently move it up and down 4-6 times against the surface of one side of the tooth, and then switch to the other side. At present, it is best to use water floss to rinse the interdental space. 4, gargle Pay attention to gargle, gargle with warm water within two to three minutes after meals can rinse out the food residue left in the mouth. Add a little salt to the mouthwash, generally with a slight salty taste is appropriate, to prevent inflammation of the gums also have a certain effect.