Hair masks are a great way to keep your curls moisturised. A hair mask is supposed to be left on the hair and scalp for a longer period of time (e.g. 15-30 minutes) before it is rinsed off and should be used no-more than 1-2 a week. When you apply a hair mask, take the time to massage your scalp as well and allow the product to fully penetrate your hair. Scalp massages stimulate blood flow to the scalp and give your hair more nutrients.
I urge you to research the ingredients
in your mask before purchasing, as a hair mask is a concentrated conditioning product you want to be getting all the properties and nutrients your hair needs, such as protein, emollients, vitamins and more!