The Massad Edentulous Lip Ruler (MELR) is a device that allows dentists to evaluate the esthetic relationships of both the upper and lower lips to the oral cavity and facial mask. Each patient has a different tooth display when they speak, relax and smile. When constructing any type of prosthesis, it is imperative that the dentist know the length of the lip when relaxed, speaking, and smiling in order to determine the height of the prosthetic components, both implants and teeth... a critical step in achieving a natural looking smile.