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yellowish brown color on the back of the tongue is often due to dried mucus from post nasal drip and sleeping with your mouth open or mouth breathing or snoring drying the mucus there.
smoking cigarettes can do this as well.
do you have sinus congestion issues or snoring issues when you sleep?
make sure when you take your antibiotics, you take some probiotics and eat some yogurt daily to help add good bacteria into your bowels to prevent diarrhea from antibiotics.
let me know if you have questions.
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