Many times, my patients present with an open mouth posture where the upper teeth rest on the lower lip. This parafunctional habit can act as a functional orthodontic appliance that can exacerbate and/or cause dental malocclusions. My main goal for my 5 – 12 year old patients is achieving lip competence or lip closure with the lower lip covering the upper teeth at rest in order to prevent orthodontic relapse, according to Vig and Cohen, 1979. The Zickefoose Lip Exerciser-ZLE and the therapy program I created after specializing in Orofacial Myofunctional Disorders for over 43 years eliminates this harmful habit.#ZickefooseLipExerciser