The OPTISMILE Podcast 120 - The Plaque Test: How Disclosing Tablets Reveal the Plaque You Can't See

IntroductionLast episode we tackled the gaps between the teeth. This time Dr Clifford Yudelman turns the spotlight on plaque itself: the soft, sticky, almost transparent film that does most of the damage in dentistry, and that even people brushing twice a day still routinely miss. Using disclosing tablets, an inexpensive dye that stains plaque in vivid colour, Dr Yudelman explains how a two-rand tablet can show you exactly where your toothbrush is falling short, what a plaque score actually means, and why this unglamorous little tool might be the single most honest thing in dentistry.Questions and AnswersQuestion 1: What on earth are disclosing tablets, and are they just for kids?1:18 - 2:19Disclosing tablets are cheap, harmless dye tablets that stain plaque so it becomes visible, and they work just as well for adults as they do for children. Chewed and swished around the mouth, they highlight exactly where brushing and flossing have missed, turning invisible plaque into a clear, physical target you can go back and remove.Question 2: Why do dentists sometimes paint purple or blue dye on teeth during a cleaning?2:20 - 3:32The dye reveals plaque that would otherwise be invisible, the same way a pilot relies on instruments rather than guesswork. At OptiSmile, the hygienist swabs the teeth, rinses, photographs the result and shows the patient in the mirror, not to shame them but to give them a visual target for better brushing, flossing and interdental cleaning.Question 3: How can I use these tablets at home to check my own brushing technique?3:32 - 4:46A quarter of a tablet is usually enough, bitten a few times and left to dissolve rather than swallowed. Depending on the tablet, fresh plaque shows up as a lighter pink, while older plaque that has sat for more than 24 hours stains a darker blue or purple; rinsing washes away the dye but leaves the stained plaque behind for you to brush off.Question 4: What is a plaque score, and what percentage should I be aiming for?4:46 - 5:47A plaque score measures how much plaque is left after brushing, and anything under 20 percent, ideally around 10 percent, is a very good result, even though many people start out closer to 50 percent. Dr Yudelman uses it to track trends rather than chase perfection, and finds it especially motivating for patients managing gum disease or cavities, who can watch their score, and their bleeding, improve visit by visit.Question 5: Why does the dye stick more around the gum line and between teeth?5:48 - 6:30Bacteria thrive in the sheltered, moist areas where a toothbrush's bristles typically miss, not because the gums there are fragile but because those spots need better tools and angles. Gentle, targeted pressure with interdental cleaning, rather than brushing harder, is what breaks up plaque before it matures into something more damaging.Question 6: Can I make my own disclosing solution at home with food colouring?6:31 - 6:58It's not recommended. Food colouring will stain plaque, but it also stains everything else in the mouth, so it doesn't give the same clean, useful feedback as a proper disclosing tablet or liquid, which is inexpensive and purpose-built for the job.Question 7: If I cannot see the plaque with my naked eye, does it really matter if it is there?6:59 - 7:48Yes, and invisible plaque is often the most biologically active kind, producing the acids that cause cavities and the chemicals that make gums bleed long before any damage is visible. Waiting for symptoms is risky, sometimes for years, which is exactly why disclosing tablets are useful: they expose that hidden phase early enough to reverse it before costly treatment becomes necessary.Question 8: How often should a patient do a plaque test at home to stay on track?7:49 - 8:43Most adults only need it in the beginning, every few days at first and then every two to four weeks once the goal shifts from discovery to simple recalibration rather than obsession. Children between about seven and ten benefit from testing every two or three days, so good technique is already a habit by the time they stop listening to their parents as teenagers.Question 9: Does plaque turn into tartar if I miss these spots for just a few days?8:44 - 9:49Plaque begins mineralising into tartar surprisingly quickly, especially near the salivary ducts, including the parotid duct by the upper molars, where saliva's high calcium content speeds up the process. Once it hardens into tartar it can no longer be removed at home and needs professional treatment, so staying on top of soft plaque saves time, cost and discomfort down the line.Question 10: Is this the ultimate tool for co-discovery, so that patients can see what you see?9:50 - 10:25Completely. Disclosing tablets replace guesswork with objective, visible evidence, which gives patients ownership over their own oral health and leads to better decisions, less unnecessary treatment, and long-term protection for both their teeth and their finances.Closing ThoughtsWhat makes disclosing tablets so useful is exactly what makes them uncomfortable: they don't take anyone's word for it. Chew a tablet, look in the mirror, and the evidence about your brushing is right there in colour, impossible to argue with and easy to act on. As Dr Yudelman puts it, if you can see it, you can fix it, and a two-rand tablet used every few weeks is a small price for that kind of certainty.Further ResourcesTeeth Cleaning in Cape Town (Scaling & Polishing)https://optismile.co.za/dental-solutions/teeth-cleaning/How a professional scale and polish removes the plaque and tartar that home brushing can't reach, including OptiSmile's Piezo ultrasonic technique.Episode 17: Professional Dental Cleaning Explainedhttps://optismile.co.za/blog/professional-dental-cleaning-explained/A companion episode covering the professional cleaning process in full, including how OptiSmile's hygienists use disclosing dye to identify plaque and tartar before scaling.Gum Disease: Early Signs, Professional Care and Recoveryhttps://optismile.co.za/blog/gum-disease-early-signs-professional-care-and-recovery/How the plaque left behind by poor brushing progresses into gum disease, and the early warning signs to watch for at home.Dental Checkups in Cape Town (Dental Exam)https://optismile.co.za/dental-solutions/dental-checkup/What a routine checkup at OptiSmile involves, including the plaque and tartar assessment that happens at every visit.A Caring Paediatric Dentist in Cape Townhttps://optismile.co.za/dental-solutions/paediatric-dentist/Relevant for parents wanting to build the plaque-testing habit early, as Dr Yudelman recommends for children aged seven to ten.Exposed: The Hidden Dangers of Ignoring Tooth Decayhttps://optismile.co.za/blog/hidden-dangers-of-ignoring-tooth-decay/Why catching plaque and small cavities early, before they progress, is the cheapest and least painful path in dentistry.Dental Health in a Nutshellhttps://optismile.co.za/blog/dental-health-in-a-nutshell/Dr Yudelman's practical product recommendations for interdental brushes, a natural next step once you can see where you're missing.Disclaimer: The content provided in this podcast, "Save Your Money Save Your Teeth" on Medical Mondays, is for informational and educational purposes only. It is not intended to serve as dental or medical advice. The insights and opinions expressed by Dr. Clifford Yudelman and any guests are designed to foster a better understanding of dental health, preventive measures, and general well-being, but should not be interpreted as professional dental or medical recommendations. Dr. Clifford Yudelman does not diagnose, treat, or offer prevention strategies for any health conditions directly through this podcast. This platform is not a substitute for the personalized care and advice provided by a licensed dental or healthcare professional. We strongly encourage our listeners to consult with their own dental care providers to address individual dental health needs and concerns. The information shared here aims to empower listeners with knowledge about dental health but must not be used as a basis for making health-related decisions without professional guidance. Your dental care provider is the best source of advice about your dental and overall health. Please always seek the advice of your dentist or other qualified health professionals regarding any questions or concerns about your dental health.