Depending on the location of the pigment and the nature of the combination with the teeth, the following methods are commonly used to make teeth white: 1, if your teeth themselves are normal in color, but due to long-term oral hygiene unclean resulting in tartar and plaque (formed by food debris and oral bacteria together) attached to the surface of the teeth, the teeth gradually become yellow and black. At this time, we can quickly remove the surface dirt and restore the normal color of teeth by periodontal scaling (i.e., people often say scaling). 2, if your teeth itself color is not normal, commonly too yellow, gray-black, black-brown, etc., then you need to take the corresponding treatment plan according to the degree and depth of tooth coloring: (1) If the pigment stays in the surface layer of the hard tissue of the teeth (science called enamel layer, generally common in fluorosis or exogenous pigmentation), can be treated by external bleaching method, through the bleaching solution in the tooth surface continuous (2) If the pigment is located in the deeper layers of the hard tissues of the teeth, it is difficult to achieve the effect simply by using external bleaching, and even if it is barely used, it is easy to relapse, then it can be done by: A. Internal bleaching method: the principle of this method is to place the bleaching solution inside the tooth (the tooth itself is a cavity structure, and this cavity is the space occupied by the dental nerve, scientifically known as the pulp chamber). This method is based on the principle of placing the bleaching solution inside the tooth (the tooth itself is a cavity structure, and this cavity is the space occupied by the dental nerve, which is scientifically called the pulp cavity) to play the bleaching effect from the inside out, thus removing the pigment from the deeper layers of the hard tissues of the tooth more thoroughly and achieving the effect of making the tooth white. However, it is worth mentioning that this method is generally only applicable to dead pulp teeth, if it is a living pulp tooth, it is necessary to first pulp treatment (i.e., kill the nerve), which is more than worth the loss; B. Resin veneer: This method is to cover the color of the tooth itself by applying a layer of resin material similar to the color of normal teeth on the outer surface of the tooth, and the effect is better in the short term. The disadvantage is that because the resin microstructure is honeycomb microporous, easily colored by food pigment, so generally about 3-4 years need to be re-treated; C. Porcelain veneers: If the teeth do not have large defects, but only poor color, you are recommended to use this method, can achieve near-perfect results. It is through the tooth lip side (towards the outside of the side) of the outer surface of the uniform grinding away a layer of dental porcelain material to reshape the tooth shape and color, because you can precisely control the tooth color index, so the cosmetic effect is better, wear resistance and teeth similar; disadvantage is more brittle, easy to disintegrate porcelain when subjected to excessive external force. D. All-porcelain crown: the outer surface of the tooth evenly abraded layer, with the above-mentioned materials will cover the entire tooth, restore the tooth shape, strength and aesthetics, the disadvantage is that the amount of abraded tooth tissue is larger, most suitable for patients with defects in the tooth itself or no conditions for veneer repair patients; Finally, although there are a variety of methods to choose from, but we recommend that you first go to a specialist dental medical unit restorative for an exhaustive Finally, although there are many options available, it is recommended that you go to a specialist dental unit for a thorough examination and let the doctor develop the most suitable treatment plan for you based on your actual situation and ask about the fees for the entire procedure before receiving treatment.