Accidentally gargling with Betadine (povidone-iodine) antiseptic solution and spitting it out is generally not harmful, though it is stronger than the gargle formulation. The 'fuzzy' feeling on your tongue is likely temporary irritation from this higher concentration. I recommend rinsing your mouth thoroughly with plain water and drinking plenty of fluids. This sensation should improve within a day or two. If you experience worsening irritation, swelling, difficulty swallowing, or if you swallowed a significant amount of the solution, please see a doctor.
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Is it harmful that I accidentally gargled with Betadine solution instead of Betadine gargle, and should I see a doctor because my tongue feels fuzzy?