Kinda freaky, because I am a newbie here & I was about to post the exact same question.

I am 23 & my sideburns are mediocre. I would like to thicken them up as well. I have been using "just for men" hair dye on them because I am a dirty blonde & this makes them appear thicker, but I am worried prolonged use might kill the hair. I wish they would fill out more, I hope someone can help us.