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renren, not sure what you're talking about but not everyone's got jet black hair--which in my opinion shines the best. The lighter your hair is, the less sheen it's going to have. I have never equated not having shine with lack of health. Also the kinkier the hair is, the less shiny it will appear.
My hair appears to shine more when straightened. Here it is very well-moisturized (just finished DCing in prep for a flat ironing session) and it is also very soft (a sign of moisturized hair), but notice the absence of shine:
After I got it straight, light seems to bounce of it much better and so it appears to have shine:
Another example...after I use coconut oil, only the section of my puff that is pulled tight has a bit of sheen. The puff itself is as dull as they come:
I think most times we see "flaws" in our hair because we're so busy trying to make it look like another head of hair we know--or like it did when it was relaxed. But if you just focus on it alone as it is today, you will start to understand what it's capable of and what is not characteristic of it in the state it is. This reminds me of the thread where folks were sharing how the definition of "done" has changed since they went natural.
My natural hair color is off-black, or what someone else might call "light black"
It's definitely NOT jet black, nor does it have the ability to reflect light like straight black hair can:
This is my friend's hair and it's not even jet black...yet because of how straight it is, light bounces it off easily and gives in bling. Her hair has no product but I'm sure if she had some shine enhancing product, you'd see something like the pic below. Sometimes light will hit her hair and you'll see it bling w/o any products. Straightness is the reason for this as well as deep dark color.