When dental caries occurs, clinically painful food impaction, hot and cold stimulation pain, or due to trauma resulting in partial loss of the tooth, while no spontaneous pain occurs, the tooth needs to be considered for filling treatment, which is often referred to as dental fillings. There are many kinds of materials for dental fillings, and the costs vary accordingly. Currently, the materials for dental fillings are divided into two main categories: one is ionic; the other is resin. Domestic ions cost about a few dozen dollars, and imported ions are over$200. Because the color is different from the normal tooth color, ion is mainly used for filling the back teeth. When there are cavities in the front teeth, resin material should be considered because it is very close to the normal tooth color, therefore, aesthetics is the biggest advantage of resin material. The cost of an ordinary resin should be$200-300, and a better resin should cost more than$400.