Ditto Jackie. The tetracyclines can discolor teeth in developing children, so pregnanct women and children under 8 (or older for those with delayed teeth) shouldn't take them. I haven't heard of any tooth discoloration in adults.
My teeth were disgusting when I was on abx, grey with brown marks. I had to get them cleaned by the dentist every 3 months even though I had an electric toothbrush. It's only surface staining, nothing is permanent.
Now I am off abx they look lovely and white again. So don't be depressed.
As Jackie said, you can get permanent marks in kids but doc's wonì't prescribe abx for kids or pregnant women at the vulnerable ages/stages.
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