These lines occur with age but they are also a result of overactive facial expressions. Hyperactivity of the relevant muscles causes lines to appear over time and can give a permanent ‘angry’, ‘tired’ or ‘aged’ look, even if age is not a problem. People who are very expressive, may develop frown lines earlier.
The anti-wrinkle injections affect the muscles underneath the skin rather than the skin so once the muscle is relaxed, the skin stretches and lines are eliminated or reduced. Smoking, excessive drinking, poor diet and prolonged exposure to the sun will make these lines worse.