Apply to the armpits and use throughout the day, if needed. If you have a history of sensitive skin, please test on a small area inside your wrist for 2 to 3 days prior to using.Jena’s Notes: For sensitive skin, shave the underarms the night before applying. Plus, a little goes a long way. If your shirts are getting stained, it’s a sign you’re using too much. Use less product and blot the underarms with a dry towel before getting dressed.