An All-on-4 implant is used to replace an entire upper or lower arch of teeth. It is an extremely strong titanium-based appliance that is anchored in place by 4 (and sometimes more) implants, which is where it gets its name. It is arguably the greatest advance in dental treatment in recent decades. Patients without teeth (“edentulous”) can now have them replaced with an option that fully matches the function and appearance of natural teeth. This is a total game-changer. Before the arrival of the All-on-4, patients had to rely on dentures to have teeth. This was an unsatisfactory solution to a significant problem.