How can I prevent wrinkle lines on the forehead if I am already beginning to see some appear?

Hi,

Forehead wrinkles are dynamic wrinkles or expression wrinkles due to to excessive contraction to the underlying frontalis muscles.

If they are just appearing, you can just opt to let it be.

When they become more pronounced and bother you, then consider botox injections.

Botox injections weaken the muscle activity and helps improve the dynamic wrinkles temporarily (4-6 months).

Hope this helps!