A 36-year-old male is reported. He visited the clinic complaining of discomfort of the tongue due to attached prosthesis and dysmasesis by mandibular deviation. The occlusion was reconstructed for the original mandibular position to improve the oral environment.Muscle tone was relieved, and the mandible was guided below. As a result, an adequate relationship could be established in the original mandibular position. Tongue habits were eliminated, and the patient was satisfied both functionally and aesthetically, suggesting that a stable condition had been maintained for a long period.In this case, the long-term follow-up through reversible treatment with a splint corrected the mandibular position and improved the tongue habit, resulting in reconfiguration of occlusion in the whole jaw. No significant problem has occurred for three years after the treatment.