I want to stop furrowing my brows when I squint. Is Botox good for this?

Botox is a great solution to decrease frown lines. An in person evaluation is required to determine the amount of Botox needed. Best,  

Beginning BOTOX® injections in your 20s can not only help
diminish existing frown lines and wrinkles, but may also help delay the
formation of deeper lines for longer. Certainly some well-placed BOTOX®
injections from a highly experienced injector can help your brow look less
furrowed and “angry” even when your face is at rest. However, I would say that
your goal of “completely paralyzing” the brows is not realistic nor is totally
freezing movement in the brow area recommended. Retaining a range of motion is
essential for the best, most natural looking results.

Yes, a Botox treatment is an ideal solution to prevent
furrowing your brown and looking angry. Botox works by relaxing the frowning
muscles (also known as the Glabellar Complex) so that you are unable to make
the movements that are undesirable. It will also help to decrease your risk of
forming lines in this area with regular Botox treatments at 3-4 month
intervals. The number of units required will be determined in your consultation
with you cosmetic physician.

Hello! You appear to be a perfect candidate.  BoTox is often used to control animation as it paralyzes the movement of muscles. 20-30units in the forehead and glabellar area should ameliorate the wrinkles to the area. The effects should provide a smooth, more vibrant appearance along with ridding the wrinkles and animation to the areas. Best wishes!

Botox will definitely improve, or possibly make disappear altogether, the furrows of your brow. 20 units usually is enough, as you mention. Botox is becoming more common in our practice among men and women in their twenties and thirties. Botox will help erase that "angry" looking appearance from your face. Definitely meet with a board certified plastic surgeon to find out more!