What is the typical price and duration of the effects of forehead Botox?

I'm worried that the wrinkles on my forehead seem to get much deeper than those around my eyes whenever I make facial expressions, so I'm considering forehead Botox. Every time I look in the mirror, I notice faint horizontal lines forming, so I thought it would be best to start taking care of it before they get any deeper...

What I am most curious about is the specific effects and price range of forehead Botox. I’m wondering what the current market price is and how long the smoothness usually lasts after the procedure!!! I’d also like to know if there is a recommended treatment interval, even though it may vary from person to person.

Also, are there any specific precautions I should take when getting forehead Botox? I'm worried about potential side effects, such as my eyebrows becoming heavy or my facial expression looking fierce..!

I heard that the procedure takes a short time, but it would be very helpful for me to make my decision if you could share reviews or satisfaction levels from those who have actually received it. Please reply!