Lines that are seen on the forehead, straight horizontal lines are called forehead lines. These are usually seen when a person tries to raise the eyebrows. They are not seen in younger individuals. They only get more pronounced with age. Forehead lines should only be reduced and not made to disappear because a plain forehead with no lines would like very unnatural. Botulinum toxin injections need to be given very cautiously in minuscule amounts to treat the forehead lines.