Dental bridges and All-On-4 implants have numerous similarities. Similar to how bridges use a set of replacement teeth, All-On-4 dental implants use a row of replacement teeth. Fixed dental bridges, however, differ in several important ways. First, unlike All-On-4 dental implants, dental bridges cannot be utilized to replace a complete arch or row of teeth. Dental bridges are typically used to replace one or a few teeth at most.