When mustaches get too long, you should trim it. Trimming your mustache can be scary. This is how I trim my mustache. I have my scissors and comb to trim my mustache and clean up my mustache’s look. It’s important to not go too fast when trimming your mustache. It is also important to wait until your mustache is dry. Wet hair is heavier and weighs down so it looks like the hair is longer than it actually is. Cutting off less than you think you want to cut is important, You can always go back and cut more off if need be. Ultimately, trimming your mustache is not necessary but can help promote even growth on your face, clean up your look, and freshen up your style. Remember how long it took to grow your mustache and keep that in mind while you are trimming.