We have the same issue in French, but I would say that it depends on how positive the topic is. Dry skin is bad, so a product for dry skin will mean to take care of and hydrate it. For curly hair, it is a neutral description of the hair, so taking care of it would be more like caring them (maintaining the hydration, helping them curl, opposed to scraightening them). If you look for product that would help straightening curly hair, it would be marketized as “straightening curly hair”, not “for curly hair”.