Introduction
Brushing is the one dental habit almost everyone believes they have already mastered, which is precisely why it goes uncorrected for decades. In this episode Dr Clifford Yudelman takes apart the assumption, and the picture that emerges is counterintuitive: the patients who brush hardest are often the ones with the most damage to show for it.
The through-line is that force is the enemy and angle is the answer. Plaque causes disease in a specific place - the small sulcus where gum meets tooth - and a brush held flat and scrubbed vigorously never reaches it, while steadily abrading the enamel and gum tissue at the neck of the tooth.
Dr Yudelman works through the modified Bass technique, the flick for the inside of the lower front teeth, the case for electric brushes and pressure sensors, why you should spit rather than rinse, and how to know when a brush head is finished. Along the way there is a digression into two-minute songs that is worth the price of admission on its own.
Questions and Answers
Question 1 (1:37)
Is there actually a wrong way to brush your teeth?
Yes, though any brushing beats no brushing at all. Scrubbing too hard, brushing horizontally like you are polishing shoes, and missing the gum line entirely are the three habits that quietly cause damage. They abrade enamel, wear away gum tissue, and leave plaque undisturbed exactly where it does the most harm.
Question 2 (3:40)
Can you tell us about the modified Bass technique and why it is the gold standard?
The bristles are angled at roughly 45 degrees towards the gum, so they slip gently under the gum margin using small, controlled vibrating motions. It targets plaque where it actually causes disease rather than just polishing the visible surfaces. It is genuinely difficult to do with a manual brush, which is one reason electric brushes are now preferred in many cases.
Question 3 (6:01)
So scrubbing is not a good thing. What happens if we do?
Scrubbing feels productive but is biologically destructive, particularly without an extra soft brush. Over time it produces non-carious cervical lesions, the wedge-shaped notches at the gum line that catch a fingernail and sting on cold air or acidic drinks. Enamel lost this way does not regenerate, and brushing force predicts recession far more strongly than brushing frequency does.
Question 4 (7:34)
Can you explain the 45 degree angle rule?
The angle aims the bristles into the gingival sulcus, the small space where the gum meets the tooth and where plaque accumulates. Held flat against the tooth, the bristles never reach it, and the result is inflammation, bleeding, and eventually bone loss. Changing the angle turns brushing from a quick freshen-up into genuine disease prevention.
Question 5 (9:00)
How do we brush the inside surfaces of the front teeth, the so-called flick?
The lower front teeth are hard to reach, so the brush is held vertically and the bristles flick along the back surfaces. This gets into the narrow spaces without heavy pressure, which matters because that area is a common site for tartar build-up and gum disease. Small technique adjustments there produce disproportionately large benefits.
Question 6 (10:13)
Should we brush the gums, or just the teeth?
You should be brushing the gums, but only as a consequence of the brush angle and only very gently. Healthy gums benefit from light stimulation, which improves circulation and plaque control. The goal is stimulation and cleaning, never abrasion.
Question 7 (10:51)
Two minutes seems to be the sweet spot. Do we need a timer?
Two minutes is far longer than most people realise, and studies that observe people brushing find most manage under a minute. Electric brushes have built-in timers that signal every 30 seconds, which works out to roughly 15 seconds per quadrant, or one to two seconds per tooth. The last brush before bed is the one that needs to be genuinely thorough.
Question 8 (13:22)
With manual versus electric toothbrushes, does the technique actually change?
The principles are identical, but a good electric brush removes much of the technical difficulty. You guide it slowly from tooth to tooth and let the brush do the work rather than scrubbing. Electric brushes are especially valuable for older patients and anyone with reduced dexterity, and pressure sensors that light up or stall the motor correct heavy-handed brushing automatically.
Question 9 (16:19)
Why should we spit but not rinse after brushing?
Spitting without rinsing leaves fluoride sitting on the teeth, where it continues to strengthen enamel long after brushing ends. This matters most for people with a history of cavities. If you have been cavity-free for years and dislike the residue, a light rinse is acceptable, but try to leave a little toothpaste behind.
Question 10 (17:45)
How often should we really be changing our toothbrush?
The general guideline is every three months, or sooner if the bristles start to splay, since worn bristles traumatise gums, clean poorly, and accumulate bacteria. Quality matters more than the calendar: a high-grade extra soft head can last considerably longer than a cheap one. Always choose the softest bristles available, and factor the cost of replacement heads in before buying an electric brush.
Closing Thoughts
The takeaway Eon lands on at the end is the right one: brushing better is not about brushing harder or longer. It comes down to angle, gentleness and consistency. Those three things are free, they take no extra time, and they are the difference between a brushing habit that protects your teeth for life and one that quietly wears them away.
If there is one action to take from this episode, it is to look at your own toothbrush bristles today. If they are splayed, you are pushing too hard — and that tells you more about your technique than any amount of good intention does.
Further Resources
Related reading from the OptiSmile website:
Electric vs Manual Toothbrushes - https://optismile.co.za/blog/electric-vs-manual-toothbrushes/
Secrets of Tooth Sensitivity and Cost-Saving Dental Care- https://optismile.co.za/blog/secrets-of-tooth-sensitivity-and-cost-saving-dental-care/
Professional Dental Cleaning Explained - https://optismile.co.za/blog/professional-dental-cleaning-explained/
How Oral Health Affects Your General Health - https://optismile.co.za/blog/how-oral-health-affects-your-general-health/
Dental Health in a Nutshell - https://optismile.co.za/blog/dental-health-in-a-nutshell/
Book an appointment or read more at https://optismile.co.za
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.