Does tetracycline stain your teeth or only the teeth of unborn babies?

Only growing teeth.: Tetracycline gets incorporated into the tooth structure of teeth that are still forming. That includes unborn babies, teenagers, and all ages in between.

Both: Tetracycline staining causes staining both unborn babies as it can cross the placenta and children of developing teeth. From looking at the area of the stains and knowing the eruption / development patterns of the teeth dentists can usually tell at what age the antibiotics were taken.