Forehead wrinkles, or otherwise called furrow lines, occur due to weakened muscle tissues. It is not necessary that wrinkles appear as a result of ageing. The fact is that wrinkles are not restricted to old age. Young people also face this problem of forehead wrinkles. Some of the reasons for this are stress, genetic heredity, lifestyle, excess make up and facial expressions. Here are the 15 natural ways of erasing forehead wrinkles without affecting your skin.