Disclosing tablets are chewable tablets that temporarily stain plaque on your teeth, making invisible buildup visible in bright pink or purple so you can see exactly where your brushing is missing. They’re simple to use: crush one between your back teeth, swish the dye around your mouth for about a minute, spit it out, then look in a mirror to find the colored patches you need to target.
What You Need Before You Start
Gather a disclosing tablet, a mirror (ideally well-lit), your toothbrush, toothpaste, and a cup of water for rinsing. Some people like to apply a thin layer of petroleum jelly to their lips beforehand, since the dye can temporarily stain skin. Have a hand towel nearby as well, because the colored saliva can be messy if it drips.
You can use disclosing tablets either before or after brushing, depending on your goal. Using them before brushing shows you all the plaque currently on your teeth so you can target those areas in real time. Using them after brushing reveals the spots your technique consistently misses, which is more useful for long-term improvement. Most dentists recommend the “after brushing” approach because it gives you direct feedback on your habits.
Step-by-Step Instructions
Remove the tablet from its wrapper and place it in your mouth. Crush it between your back teeth, but don’t swallow. Use your tongue to spread the dye across every surface of every tooth, including the backs, the chewing surfaces, and along the gumline. Keep working the dye around your mouth for a full minute to make sure all teeth and gums are coated with color.
After one minute, spit everything out into the sink. Rinse your mouth gently with water to clear away the excess dye. Don’t rinse too aggressively. You want to remove the loose color from your cheeks and tongue while leaving the stain that’s stuck to plaque intact.
Now look in the mirror. The colored areas are where plaque is sitting on your teeth. Pay close attention to the gumline, the spaces between teeth, and the inner surfaces of your lower front teeth. These are the most commonly missed zones. If you used the tablet after brushing, the stained areas show you exactly where your technique needs work.
Brush the stained areas thoroughly until the color is gone, then check again. Once no colored patches remain, your teeth are clean. Some stubborn staining between teeth may need floss or an interdental brush to remove.
Two-Tone vs. Single-Color Tablets
Basic disclosing tablets stain all plaque the same color, usually bright pink or red. Two-tone tablets use two different colors to distinguish between new plaque (typically pink or red) and older plaque that’s been sitting on your teeth for more than 48 hours (usually blue or purple). The two-tone version is more informative because older plaque is harder, stickier, and more damaging to your gums. If you’re seeing blue or purple patches regularly, it means certain areas are being missed across multiple brushing sessions, not just one.
How Often to Use Them
There’s no strict rule, but the most benefit comes from using them regularly for a short training period. Using a disclosing tablet once a day for a few weeks helps you learn your trouble spots and adjust your brushing angle and technique accordingly. After that initial phase, checking once a week or every couple of weeks is enough to maintain good habits.
The results from consistent use are significant. In a study of schoolchildren who self-checked with disclosing solution over several months, plaque scores dropped from 60.7% to 38.7%, a reduction of roughly one-third, after just three months of regular feedback. The overall plaque severity score was cut in half over four months. The takeaway is that the tablets work not because of any cleaning action, but because seeing your plaque changes your behavior.
Tips for Children
Disclosing tablets are one of the best tools for teaching kids to brush properly, because the colored stain turns an abstract concept (“you have plaque”) into something visible and concrete. Most products are designed for children old enough to chew a tablet and spit reliably without swallowing, which generally means age six and up. Younger children should only use them with direct adult supervision.
Kids tend to find the bright colors fun rather than gross, which makes the whole process feel like a game. Have them brush first, then use the tablet so they can see where they missed. Let them try to brush away the remaining color on their own before you step in to help. Over a few weeks, most children start reaching the spots they used to skip without being reminded.
Staining and Cleanup
The dye in disclosing tablets washes off teeth completely once plaque is brushed away, and any residual color on your tongue, gums, or lips fades within a few hours. It won’t permanently stain your teeth or any dental work like fillings or crowns.
Your sink and countertop are another story. The dye can leave pink or purple splotches on porcelain, grout, towels, and clothing. Wipe down surfaces immediately after use, and consider wearing an old shirt if you’re prone to dripping. Running water while you spit helps flush the dye before it settles into the basin.