The consequences of not treating improper tongue function may be very important as this organ can influence face development and dental therapy. The role of the tongue in the development of the skeletal structures of the face has been considered in different perspectives over the years. For some, the tongue adapts to the "tongue box," for others the "tongue box" has been created and stabilized by the morphogenetic action of the tongue during development and growth. A case of ankyloglossia treated with lingual frenectomy and followed clinically and radiologically for seven years is reported. Spontaneous upper arch expansion occurred and therefore orthodontic treatment following surgical intervention was unnecessary.