The yellowing of teeth is usually due to the presence of a variety of bacteria on the surface of the teeth, bacteria secrete a sticky substance, so that tea scale, tobacco stains and minerals in drinking water adsorbed on it, thus making the teeth yellow. The clinical trick to remove yellow teeth in five minutes does not exist, but you can improve yellow teeth by scaling, bleaching, porcelain and whitening tooth paste, etc. 1, scaling: go to the regular hospital dentistry or dental clinic for scaling, which can remove the bacteria and calculus on the teeth, reduce the onset of periodontal disease and relieve the symptoms of yellow teeth. In addition, you can also use ultrasonic scaling, that is, through ultrasonic vibration, smash tartar, remove dental stains, plaque, so as to clean, remove the role of yellow teeth; 2, bleaching: bleaching agent will be applied to the surface of the teeth, auxiliary application of cold light, heating, laser, etc. to achieve the purpose of removing yellow teeth; 3, porcelain: if there are cracks or mutilation of teeth, you can use porcelain, but it will cause some surrounding teeth 4, white teeth paste: teeth veneer can be carried out their own operation, more convenient, but the operation is more difficult, the period is also long. In addition, for teeth yellowing may be due to the influence of drugs, such as tetracycline buildup resulting in yellow teeth, need to be treated accordingly according to the extent of the lesion. For those with relatively light tooth staining, decoloration can be used. For those with heavier staining, porcelain restoration can be used. For the fluorosis caused by water quality problems, the mild ones usually do not need treatment, the moderate ones can be bleached and decolored, and the severe ones can be restored cosmetically with resin and porcelain. If there is some caries or periodontal disease before treatment, it must be treated before the relevant yellowing treatment can be performed.