Fine – The most delicate and the most easily damaged. Many black women have this type of hair width.
Medium – More resistant to damage as they are stronger and more elastic but they can still be prone to damage.
Coarse – This is the strongest of hair textures with a very wide in circumference which is the most resistant to damage.
Knowing your hair’s width or texture is necessary because it affects your ability to retain length. Hair density doesn’t get as much discussion within the natural hair community as much as hair length, porosity or texture but it’s no less important.
Understanding and knowing your hair’s density can give more insight into how to take care of your hair and which products will work best for you.
The density of your hair has NOTHING to do with the thickness of each individual strand. The number of hairs within a specific area (usually a square inch) determines your hair’s density and the average person has about 2,200 hairs within a square inch.
There are three types of hair density: Low, Medium and High. Now the most accurate way to determine your hair’s density is having someone count the hairs within a square inch on your head but there is a much easier way to find out.
Start with dry hair, because hair that’s wet will often look thinner than it really is. Let your hair hang loose in its natural, unparted shape and look at it closely from all different angles. If you can see your scalp very easily, then you have low hair density. If you can see some of your scalp, you have medium hair density. If your scalp is difficult or impossible to see, then you have high hair density. Naturallycurly.com
I’m not sure how accurate this method of testing would be for those with afro hair types because the evolutionary purpose of afro hair appears to be to protect our heads from the sun despite the fact that we have the lowest density hair type. Essentially most afro texture hair in it’s natural state would appear high density even when it’s not. Perhaps a more accurate way to check density of afro hair would be in it’s stretched state.
In a nutshell, we cannot grow hair where it has never grown before so increasing hair density is virtually impossible. If you have had low density hair all of your life you cannot find a product or DO something that is going to miraculously make more hair appears within a square inch of your scalp.