Eating foods that contain food dye almost always discolors the tongue. Any color will dissolve and fade over time but certain dark colors such as dark green, blue and black are more noticeable than others. It’s usually easy to get rid of these colors or at least fade them so the tongue doesn’t look quite so diseased. A quick trip to your kitchen cabinet or to the supermarket should provide all the tools necessary.
Rinse your mouth out well to remove any residual dye from the candy. Brush your teeth with toothpaste to remove any candy that may be left on your teeth. Otherwise it can transfer to your tongue, discoloring it again.
Sprinkle plain baking soda directly onto toothbrush bristles. Use enough baking soda to cover the tops of all bristles.
Stick out your tongue. Scrub the toothbrush over your tongue just as if you were scrubbing any stained area. Baking soda is abrasive, but only gently so. It also is deodorizing, so you’ll also have a fresh mouth after this.
Rinse the toothbrush and your mouth with cool water. Check your tongue in the mirror. If it is still discolored, brush your tongue again with the baking soda.
If you don’t like the taste of baking soda, use a little toothpaste (or mouthwash) on your tongue after using the baking soda. If you own a tongue scraper, it also will help remove black discoloration from the tongue. Some infections, diseases and even medications can cause a black tongue, at least temporarily.