If only 1-2 teeth are missing and there are other teeth present before and after the gap of missing teeth, the following methods can be used for restoration. Dental implants are artificial roots (usually pure titanium) that are surgically placed in the alveolar bone in areas where there are no roots, and then a crown (braces) is made on top of the artificial root after it has been well integrated with the bone tissue. The advantage of the implant denture is that it does not destroy the adjacent teeth. Since it is a fixed restoration, it is comfortable, has little foreign body sensation, has high chewing efficiency, and is equivalent to about 80% of the function of a real tooth, with a survival rate of 90% for 5 years and 85% for 10 years. The disadvantage is that surgery is required, which is more expensive, takes longer (may take several months) and sometimes requires bone grafting first. It is a very mature technique and has been performed more often outside of developed countries in Europe and the United States, and more often in China in the last 10 years. Fixed bridges are used to restore the shape of the adjacent teeth (called abutment teeth) by first grinding them down to the desired shape and then restoring the adjacent teeth with full crowns (braces) or partial crowns and restoring the missing tooth area with a one-piece cast bridge. Advantages: close to natural tooth shape, comfortable, no daily removal, high chewing efficiency. The disadvantage is that the adjacent teeth are destroyed, the price is higher, and the amount of tissue removed is higher. However, it is ideal if the adjacent teeth have residual roots and crowns or if you need to make a crown restoration yourself. A removable denture is a removable denture that is fixed to the surrounding adjacent abutment teeth by means of a metal hook (called a retainer in technical terms). There are two major advantages of a removable denture: 1) it is relatively inexpensive and 2) it removes relatively little tooth tissue. There are also several disadvantages of removable denture restorations: 1 relatively small function, the ideal function of the removable denture is equivalent to 25% of the function of natural teeth, 2 larger volume, foreign body feeling is relatively strong, easy to produce malignancy, increased saliva, unclear speech, oral space becomes smaller, 3 easy to produce pressure pain, need to go back to the hospital to adjust the cushion, 4 the first wear requires a period of adaptation, daily after meals need to be removed and cleaned, there is a micro-motion. The chewing efficiency is low, and the exposed metal ring affects the beauty, and the accumulation of food scale caused by not cleaning under the abutment or around the ring in time will easily cause the caries of adjacent teeth. Bonded bridge is a kind of fixed restoration by bonding the bridge to the neighboring teeth on both sides through resin cement. The advantage is that the amount of tooth grinding is small, and because it is a fixed restoration, it is comfortable and does not need to be removed, and other characteristics are similar to the ordinary fixed bridge. The disadvantage is that a certain amount of adjacent teeth still need to be removed, the long-term effect depends on the bonding effect, and there is a possibility of debonding, the longest period of use of a bonded bridge is less than 8 years, with an average of 3-5 years.