Baby has black line on teeth. What can it be?

His mother said that she had this black line on her teeth up until she got pregnant with her son. He is a year and he also has this black line across the front of his teeth. Apparently, her twin sister's little girl also developed this black line. The dentists are not concerned, but I was just curious. What is this called?
Serious answers only, please. Thank you.

I already tried to google "black line on teeth" and nothing came up that really fit with what I'm seeing. (You don't need an MRI to see the black line.)
Please, serious answers only. Thanks for the help.

Answers:
I don't know either but I would have to guess that it is something genetic since her sister's kids have it and she had it too.
I tried looking it up on different sites and I can't find anything either.
Sorry.
My best guess it is some type of vitamin deficiency causing it...just a thought..
It sound like a vitamin defincieny and or maybe some sort of teeth degeneration due to type of formula he had as a baby.

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