Disclosing tablets are chewable tablets used to make dental plaque visible.
The tablets, sold over-the-counter in many countries, contain a dye (typically a vegetable dye, such as Phloxine B) that stains plaque a bright color (typically red or blue). After brushing, one chews a tablet and rinses. Colored stains on the teeth indicate areas where plaque remains after brushing, providing feedback to improve brushing technique. For self-examination, a dental mirror may be needed. More sophisticated varieties contain several dyes, which selectively stain plaque of different ages. With the most common variety, immature plaque stains red, mature purple, and pathological acidic plaque blue. This is owing to the blue dye washing off immature plaque, and acid degrading the red dye.
An example of a dye with a patented use as a "Dental Plaque Disclosing Agent" is Erythrosine.
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Source of the article : Wikipedia
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