Just bad hygiene
We adopted my daughter when she was 2 1/2 from Russia... while her teeth were straight, they were filthy and yellow (our guess was that she simply had really poor hygiene - not sure she had ever seen a toothbrush before we introduced her to it).
We were lucky. Her teeth were fine - not decayed at all, just really dirty - bad breath, etc. She just had a 4yr checkup at the dentist and all is still well.
What I'm trying to say is that pictures only show a part of the picture. Hope all goes well for you
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