Abstract: An apparatus for treating peri-implantitis having working angles to allow the user access to difficult to reach areas around the teeth and gums. The apparatus has a first portion and a second portion. The first portion lies on the x-y-plane and the second portion lies on the z-plane. The second portion has an even profile along its length and the length prevents the apparatus from breaking when used at an optimal frequency. The second portion is shaped so as to interchangeably mate with multiple inserts providing the user with different working surfaces.