How long does wrinkle botox last?

When I was working, I had to look at the computer a lot, and because my eyes weren't good, I had a habit of frowning.

After working like that for about 10 years, I developed deep wrinkles between my eyebrows, and even when I wasn't frowning, the wrinkles between my eyebrows were particularly noticeable.

Wrinkle Botox If I get it right, will it only smooth out the wrinkles between my eyebrows?

How long will this last?

Wrinkle Botox I'm also curious as to whether this is something that needs to be done periodically throughout life, or if it's okay to do it a certain number of times, like 10 times, for a while.

Wrinkle Botox Will it hurt a lot?

I want to try the procedure, but I'm so scared of injections that I have a lot of concerns.