The technique All-on-Four is a dental implant treatment that involves placing four implants strategically in the maxilla or mandible to support a complete fixed prosthesis. Two implants are placed in the front, straight, and the other two in the back, tilted at a 45-degree angle to maximize the use of available bone. This approach allows the entire denture to be rehabilitated in a single day, providing a fast and stable solution for patients with significant tooth loss.