Lip competency plays an important role in growth and development within the craniofacial complex. It is an essential component of proper oral rest posture. When lip incompetency occurs, function, growth, esthetics, speech, and breathing can all be affected. Determining the underlying cause is an essential part of properly treating this aspect of oral rest posture. Traditionally, treatment has often included orthodontic treatment for correction of overjet, Botox injections, or surgery. However, the most effective techniques include addressing the underlying cause and improving the function of the lips rather than only addressing the cosmetic appearance of the lips. Orofacial myofunctional therapy has proven to be effective in treating lip competency issues and should be considered a valid treatment option to be used in conjunction with orthodontic treatment, and before Botox and surgery are considered.