How long do the effects of Botox for forehead and glabellar wrinkles last?

Because of my habit of frowning, the wrinkles between my eyebrows have deepened and wrinkles have started to appear on my forehead.

wrinkles Botox I want to improve my wrinkles through treatment, but I'm worried that it might be too much and cause side effects like an unnatural look or a heavy forehead.

It smoothes out wrinkles while maintaining a natural look. wrinkles Botox I'm curious about the treatment know-how and tips for choosing a hospital. wrinkles Botox How effective is it after the procedure? Whether it lasts, And please share your experience on whether periodic treatments are necessary.