For example, there are several levels of tooth loss in the lower jaw: Entry level: implant removable dentures with 2 implant roots placed in the lower jaw. The implant roots provide a very solid anchorage for the removable teeth, but the chewing force is mainly burdened by your own gums and alveolar bone. It means that the movable dentures will not fall out, but the efficiency of eating is average. However, you have to take the removable teeth off every night and cannot sleep with them on. Suitable for older patients, and patients with tight budget. Intermediate: Implant dentures with 4 implant roots. The implant roots provide a very stable anchorage for the removable teeth, and the chewing force is basically taken care of by the implant roots. This means that the removable denture will not fall out and the eating efficiency is better. However, you have to take off the removable teeth every night and cannot sleep with them on. Premium: Implant fixed dentures with 6 implant roots and 12 porcelain teeth installed. The patient cannot and does not need to remove the porcelain teeth. Aesthetics, comfort and chewing are all good. However, special attention should be paid to oral hygiene, careful brushing and flossing. Suitable for patients who have sufficient bone mass and require the best results. The above 3 cases are applicable to the lower jaw. The same 3 levels exist when all maxillary teeth are missing. However, since the quality of bone in the upper jaw is usually worse than that in the lower jaw, 2 additional implants are usually added to improve the success rate.