Why Does Pepto Make Your Mouth Black? 8+ Reasons

why does pepto make your mouth black

Why Does Pepto Make Your Mouth Black? 8+ Reasons

The temporary darkening of the tongue and/or oral mucosa after ingesting Pepto-Bismol is primarily attributed to the bismuth subsalicylate, the active ingredient in the medication. Bismuth reacts with trace amounts of sulfur present in saliva and the gastrointestinal tract. This reaction forms bismuth sulfide, a highly insoluble black salt. The dark precipitate then deposits on the tongue’s surface, creating the appearance of a black tongue. This is a superficial discoloration and is not harmful.

This side effect, while visually alarming, is generally harmless and self-limiting. It is essential to understand that the discoloration is a chemical reaction, not an indication of infection or a serious medical condition. The phenomenon has been observed since bismuth-containing medications were first introduced and documented in medical literature.

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