The bone that forms the forehead is the:

The frontal bone forms the forehead. Cosmetologists learn the bones of the skull and face — such as the frontal (forehead), the two parietal bones (sides and top of the cranium), the zygomatic bones (cheekbones), the maxillae (upper jaw), and the mandible (lower jaw) — because services to the face, scalp, and neck involve these structures. A basic knowledge of facial bones supports safe and effective work and is part of the anatomy content on the licensing exam.