Head and Neck Surgery is a surgical specialty that mainly treats benign and malignant tumors of the face, nasal cavities, paranasal sinuses, mouth, pharynx, larynx, thyroid, salivary glands, soft tissue of the neck, parathyroids and tumors of the scalp.
Orthognathic surgery is a specialty of dentistry that boils down to shaping your face, placing your teeth in the correct position (with orthodontics) and repositioning your jaws (with corrective surgery).