There are many toothpastes on the market that can remove bad breath and whiten teeth, such as mint composition toothpaste, baking soda whitening toothpaste, descaling and brightening toothpaste, fresh vertical toothpaste, etc., which contain some aromatic substances that can achieve the purpose of fresh breath in a short period of time, while brushing can reduce the bacteria in the mouth and thus achieve the effect of removing bad breath; toothpaste contains some rubbing substances that can remove stains on teeth through physical friction and restore the original color of teeth. Toothpaste contains some rubbing substances, which can remove the stains on teeth through physical friction and restore the original color of teeth, but toothpaste cannot achieve the purpose of whitening teeth and whiter than the original color of teeth. If patients have the need to remove bad breath and whiten teeth, they can achieve the purpose through scaling, bleaching, dental veneers, etc. 1. scaling: going to the regular hospital dentistry or dental clinic for scaling 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 to break down tartar, stains, plaque, so as to achieve the role of cleaning, taste and yellowing; 2, bleaching: bleaching agent will be applied to the surface of the teeth, the auxiliary application of cold light, heating, laser and other ways to promote the decomposition of bleaching agent, so as to achieve the purpose of removing yellow teeth; 3, dental veneers: If there are stubborn pigment teeth, you can go to the hospital for dental whitening veneers to improve the situation of yellow teeth; 4, other: patients can also use dental floss, mouthwash and other methods to reduce bad breath.