The penultimate tooth may be the first molar or the second molar, and the restorative options available after extraction are fixed partial denture and implant denture, as follows. 1. Fixed partial denture: It relies on adhesive or fixation device to connect artificial teeth with abutment or implant to repair the anatomical shape and function of the missing teeth, and it cannot be removed freely, the disadvantage is that it needs to grind the adjacent teeth as abutment, and it may have damage to the neighboring teeth. 2. Implant denture: After the implant replacing the natural tooth root is implanted into the jawbone, a stable bone union is formed between the implant and the jawbone, and then there are abutments and artificial crowns to restore the form and function of the missing teeth, which is the most ideal way of restoration, with the disadvantage that it is more expensive. For the same disease, patients with different conditions will choose different restorative methods, so it is recommended to go to the hospital in time and choose the suitable restorative method with the help of the doctor.