How Long Should Your Armpit Hair Be To Wax. You will probably end up waxing your underarms once every 2 weeks. It's best to wax your underarms every two weeks, as it's obvious when there's regrowth, coba says.
And if you’ve waxed, expect your armpit hair to grow back slower and more thin, as you’ve been yanking out your hair at the root. You should know, however, that shaving your armpit hair can lead to issues. It's about the size of a sprinkle.
Armpit hair should be at least 5 millimeters long before you can get your hair waxed.
Your armpit is very sensitive, and nicks and cuts will be more annoying here than on your face. You should observe the same length when waxing in this area. Once the hair becomes finer it can be waxed at a shorter length. Raise your arm and try to get the skin as straight as possible for each stroke.