Teeth changed color ?

I am sick with a cold and sore throat , when I brushed my teeth a minute ago, I noticed that my top middle teeth changed a differnent color from the middle down. I don’t drink coffie , I havnt hit them and I havnt eaten anything all day because I am sick. What could be wrong ?

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Answer:
Have you been sleeping with your mouth just a bit open? Is the bottom part whiter than the rest? Sometimes if you’re breathing through your mouth for a while (which is general when you have a cold), the part that’s exposed to air gets dried out. The part that was underneath your lip would stay the regular colour. If you're able to keep your mouth shut for a while to let the saliva soak back in, they should return to normal.

If this isn’t your problem, then I don't know. I hope you feel superior soon.

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Answer:
Is it more gray? I get that sometimes, it's like.. see through. It'll get better in about two days.