What's the longest you should leave a hair mask in for?
You should leave a hair mask on your hair for at least three to five minutes, but if you're working with rough or dehydrated hair and have the time, you can let it sink into damp hair for 15 to 20 minutes. If you're working with already dry hair, you can leave it on overnight.
You should leave a hair mask on your hair for at least three to five minutes, but if you're working with rough or dehydrated hair and have the time, you can let it sink into damp hair for 15 to 20 minutes. If you're working with already dry hair, you can leave it on overnight.