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How to prevent ingrown armpit hair
Wet your armpit thoroughly before shaving.
Wet armpit hair, and wet hair in general, cuts much more easily than dry hair. When the hair is dry, it is much stronger, so when you are shaving dry hair, the razor tugs harder at the hair, causing it to break improperly.
It is best to allow your underarms to soak for at least five minutes before shaving. It is better to shave more towards the end of your shower or bath so that your armpit hair has had time to absorb the water.