The frenulum can be a dental support that makes a tooth in the ideal or correct position to improve oral aesthetics. It is implanted by the orthodontist. Dental support or retainer. In Colombia, a frenulum is also called a tissue located under the tongue and that prevents its adequate mobility and that affects language or diction. In medicine, frenulum is also called the layer of skin located on the underside of the penis that joins the glans to the inner surface of the foreskin. Brake diminutive.