The contrast between full and not full forehead is mainly manifested in the protruding degree of forehead. People with full foreheads have higher foreheads, slightly protruding, and the whole forehead line is smooth and natural. For people with full foreheads, the forehead lines are relatively flat, and there is no obvious protrusion on the forehead, which makes the whole head flatter. In addition, the shape of the forehead will be influenced by many factors such as heredity, age and weight.