A 5-year-old patient presents with mobility of primary teeth E (upper right central incisor) and F (upper right lateral incisor). A radiograph reveals a mesiodens between E and F, and tooth F has complete root resorption. What is the most appropriate treatment?

Three pathological findings require treatment: (1) A mesiodens — a supernumerary tooth causing pressure and root resorption. (2) Tooth F — complete root resorption makes it non-viable. (3) Both primary teeth are mobile and compromised. The appropriate treatment is to extract ALL THREE: Extract the mesiodens to eliminate the source of pressure/resorption and allow permanent teeth to erupt normally without obstruction. Extract tooth F because it has complete root resorption and no viable root structure. Extract tooth E if it is mobile and functionally compromised. The mesiodens MUST be removed to prevent delayed or ectopic permanent incisor eruption, midline diastema, and further resorption. Removing only the primary teeth while leaving the mesiodens in place leaves the cause unresolved and allows continued damage to the developing permanent teeth.