Some of the most common signs that a scalp is healthy include: no dandruff, little to no oil production, no inflammation, and Scalp Brightness (a measure of how light or dark the hair is). Most of the time, my scalp is healthy and I have a little dandruff every now and then (generally when I'm stressed out), but it's limited to a couple of flakes here and there. If you want, you can also consider getting a suitable treatment for your hair from

One sign that your scalp is low on oil is dryness. If you are experiencing dry hair, that means that your scalp may lack essential nutrients like vitamin A (which helps your body produce oils) as well as vitamin B-complex (which allows the skin to produce collagen). I typically experience very little if any dryness. 

Another sign that your scalp is low in oil is that your hair appears dull. I would say this one is more important than dryness. If you notice your hair looks dull, it's a pretty clear indication that there's not enough oil in your hair to prevent the hair from becoming dry and brittle.I typically cleanse my scalp once or twice a week with my usual cleansing agent and then apply oils, which are comprised of many different nutrients and antioxidants (primarily vitamins). 

I use some sort of combination of these treatments on my head as well as on my beard – never neglecting either area. If you want to get a deeper understanding of what are the best oils for healthy, moisturized hair and skin, please check out The Hair Fuel official website I suggest bookmarking this link, because you're likely to find it very useful.