Does an Electric Toothbrush Actually Save Your Teeth?
Clinically reviewed by Dr. Abinaash Kaur, DDS, RCDSO, on 2026-10-19. Dr. Kaur is a general dentist in Toronto (Bloor West Village) registered with the Royal College of Dental Surgeons of Ontario.
A little. In the longest study we have, people who used an electric toothbrush kept an average of 0.36 more teeth than manual brushers after eleven years, which the researchers also described as 19.5% more teeth retained (Journal of Clinical Periodontology via PubMed).
In that same study, people who already had severe gum disease got no measurable benefit from switching (Journal of Clinical Periodontology via PubMed).
Both of those numbers are real, and neither one is what the packaging promises. Here's the honest size of the thing you bought.
What do the toothbrush studies measure?
Plaque and gum scores, usually over one to three months. That's the whole evidence base behind most of what you read.
I said in my earlier post on choosing a brush that electric brushes remove a bit more plaque and that I recommend them for most people. I still do. This post is about whether that bit adds up to anything over years, which is a different question with different evidence.
The people who ran the largest review of short-term trials were careful about this. Their conclusion, in full, is that powered toothbrushes reduce plaque and gingivitis more than manual brushing in the short and long term, and then: "The clinical importance of these findings remains unclear" (Cochrane Database of Systematic Reviews via PubMed).
An independent review put a size on it. Looking at plaque removal, the authors reported "a high certainty for a small effect" of a powered brush over a manual one (International Journal of Dental Hygiene via PubMed).
High certainty, small effect. Those two words belong together, and the marketing only ever keeps the first one.
What happened to real people after eleven years?
Researchers followed 2,819 adults in northern Germany and checked their mouths repeatedly over eleven years (Journal of Clinical Periodontology via PubMed).
Electric brush users came out ahead on gums. They had less progression in gum pocket depth and less attachment loss, 17.7% less decay progression, and the tooth count above (Journal of Clinical Periodontology via PubMed).
An independent reviewer summarised the same paper for other dentists, and the title of that summary does the work of a paragraph: "Very small differences in caries, periodontal parameters, and tooth loss between powered and manual toothbrushing after 11 years" (Journal of the American Dental Association via PubMed).
A second cohort of 2,214 people followed for seven years pointed the same way on gums. Electric users had lower median pocket depth, 2.21 mm against 2.30 mm, and better attachment levels, with the effect on missing teeth more pronounced in people over 50. That study found no significant effect on decayed or filled surfaces (Journal of Clinical Periodontology via PubMed).
So the two cohorts agree on gums and tooth count, and disagree on decay. That's a normal amount of messiness for real-world research, and it's worth knowing before anyone quotes you a single number.
Who were the electric-brush users in that study?
Not a random slice of the population, and this is the part I'd want explained to me.
At the start, the electric-brush users were younger, averaging 46.3 years against 53.4 for manual users. They were better educated, more likely to have seen a dentist in the past year, and far less likely to have severe gum disease before the study began (Journal of Clinical Periodontology via PubMed).
People who buy an electric toothbrush tend to be people who already look after their teeth.
The researchers knew that and adjusted for it. Their own limitation reads: "the associations observed in this study were not lost even after adjusting for all the relevant factors, although residual confounding cannot be excluded" (Journal of Clinical Periodontology via PubMed). One of the senior authors also disclosed a Procter and Gamble grant that paid a scientist's salary for six months, stating it had no influence on the design, analysis or interpretation (Journal of Clinical Periodontology via PubMed).
None of that makes the study wrong. It means the brush was never the only thing separating those two groups, which fits what I wrote about the habit surviving the upgrade.
Does it help if you already have gum disease?
In that eleven-year study, no. The finding is stated plainly: "Subjects with severe periodontitis did not benefit from the usage of PTB" (Journal of Clinical Periodontology via PubMed).
Read what that does and doesn't say, because it isn't a verdict of hopelessness.
A toothbrush of any kind cleans above the gumline. Once pockets are deep, the bacteria and hardened deposits sit below where bristles reach, and that's treated rather than brushed. The benefit showed up in the people whose gums were healthy or mildly affected, and it faded as the disease got worse (Journal of Clinical Periodontology via PubMed).
So if your gums are already in trouble, the answer isn't a better brush. It's getting the deposits below the gumline cleaned out properly, and understanding what the bleeding has been telling you. How often you need to be seen after that depends on your gums, and we've written about how that interval gets decided.
Does cleaning between your teeth matter more than the brush?
On the evidence we have, it may well.
Researchers tracked what changed across German national dental surveys over 17 years, and opened with a line most toothbrush articles skip: "The long-term effectiveness of powered toothbrushes (PTBs) and interdental cleaning aids (IDAs) on a population level is unproven" (Journal of Dental Research via PubMed).
Then they split the credit. Among seniors, of the improvement they could explain in cavity-free tooth surfaces, powered brushes accounted for 1.72 and cleaning between the teeth accounted for 5.80, out of 8.44. On the number of teeth, it was 0.49 against 1.25 (Journal of Dental Research via PubMed).
Floss and interdental brushes did more of the work than the motor did.
That tracks with what a brush can physically do. No bristle head reaches the flat surfaces where two teeth touch, which is why we've compared water flossers against string floss and argued about whether flossing earns its reputation.
What do Canadian dental bodies say?
Less enthusiastically than the advertising, and with more precision.
The Ontario Dental Association says you may wish to consider an electric brush, because "Electric brushes have been shown to better maintain your oral health" (Ontario Dental Association). The Canadian Dental Association is neutral about it, listing a soft-bristled brush first and adding "You can also choose an electric toothbrush" (Canadian Dental Association).
The most exact Canadian statement comes from the Canadian Dental Hygienists Association, whose position paper opens its recommendations with "Manual toothbrushes are a viable option for plaque control" and then narrows the claim: the only powered designs shown to be clinically superior are rechargeable ones with an oscillating, rotating action, while "other designs of power toothbrushes have been shown to be as effective as manual toothbrushes" (Canadian Dental Hygienists Association).
Health Canada adds the bit I like best, about older adults with reduced dexterity: an electric brush may improve plaque removal, and "The older adult's choice for manual or electric toothbrush should be respected, as supporting their preference can improve toothbrushing compliance" (Government of Canada).
The brush you'll use beats the brush that's theoretically better and sits in a drawer.
Why do the biggest numbers come from the biggest brands?
Because of who ran the study, and the papers say so themselves.
The most favourable results in this field come from a 2024 analysis reporting that oscillating-rotating brushes beat both manual and sonic brushes. Its methods state it "was conducted from a single database (Procter & Gamble Oral Care Clinical Archive)", and its authors are listed at Oral Care Research and Development, The Procter & Gamble Company (International Dental Journal via PubMed).
That isn't a scandal, and the company makes no secret of it. It's a reason to weight the independent reviews differently, and those are the ones reporting a small effect and an unclear clinical importance (International Journal of Dental Hygiene via PubMed).
The Canadian seal is worth understanding on the same terms. Two power toothbrushes currently carry the CDA Seal and no manual toothbrush does (Canadian Dental Association), which looks like a verdict until you read how the programme works: "manufacturers are required to state the oral health benefit(s) that they wish to have validated by CDA, and submit evidence to support their claim" (Canadian Dental Association).
Nobody has put a manual toothbrush forward. The empty category reflects who applied, not who won, and the claims validated are about plaque and gingivitis rather than keeping teeth.
Are there people it doesn't help at all?
A few groups, and the research here is more useful than the marketing.
When someone else does the brushing, the advantage disappears. A review of 16 publications found that a powered brush compared with a manual one "in the hands of people with PD or ID or in the hands of their caregivers results in no clinical difference in effectiveness on parameters of plaque and gingival inflammation", at a low level of evidence (Special Care in Dentistry via PubMed). Brushing your own teeth with a weak grip is the situation where a powered brush earns its place (Government of Canada).
Around dental implants, a Cochrane review found no statistically significant difference between powered and manual brushes for maintaining or recovering the health of the soft tissue (Cochrane Database of Systematic Reviews via PubMed). Those authors add a caution I'd repeat: that finding shouldn't be read as meaning current maintenance routines don't work (Cochrane Database of Systematic Reviews via PubMed).
There's also a practical caution for families caring for someone with dementia. The College of Dental Hygienists of Ontario notes that while an electric brush may be easier for a caregiver to use, "electrical appliances may disturb, or be a safety concern with, some persons with dementia", and suggests a manual brush with bristles on three surfaces as an alternative (College of Dental Hygienists of Ontario).
In 25 years in Bloor West Village I've watched families fight this battle at kitchen tables. The right brush is the one that gets used without a struggle.
So here's where I land, and it hasn't changed. Buy the electric brush if you want one, because a small edge compounded over decades is still an edge. Then spend your real effort on the two things that moved the numbers most: cleaning between your teeth, and treating gum disease rather than brushing at it.
Frequently Asked Questions
Q: Will an electric toothbrush stop me losing teeth? It's associated with keeping slightly more of them. Over eleven years, electric users retained an average of 0.36 more teeth than manual users, described by the researchers as 19.5% more teeth retained (Journal of Clinical Periodontology via PubMed). An independent summary of that same study was titled "Very small differences in caries, periodontal parameters, and tooth loss between powered and manual toothbrushing after 11 years" (Journal of the American Dental Association via PubMed). It's a real edge and a small one.
Q: I already have gum disease. Should I buy an electric toothbrush? You can, but don't expect it to be the fix. In the eleven-year study, "Subjects with severe periodontitis did not benefit from the usage of PTB" (Journal of Clinical Periodontology via PubMed). A brush cleans above the gumline, and deep pockets need to be cleaned out by a dentist or hygienist. Get the disease treated first, then keep it stable with whichever brush you'll use.
Q: Is flossing more important than the type of brush I use? On the long-term population data, cleaning between the teeth did more of the work. Across 17 years of German survey data, of the explained improvement in cavity-free surfaces among seniors, powered brushes accounted for 1.72 and interdental cleaning for 5.80, out of 8.44 (Journal of Dental Research via PubMed). The same paper notes that long-term population-level effectiveness for both is unproven.
Q: Why do the studies from toothbrush companies show bigger benefits? Because they're drawn from the company's own trials. The 2024 analysis reporting the strongest results states it "was conducted from a single database (Procter & Gamble Oral Care Clinical Archive)" and its authors work for that company (International Dental Journal via PubMed). Independent reviews report a small effect (International Journal of Dental Hygiene via PubMed), and the largest short-term review says "The clinical importance of these findings remains unclear" (Cochrane Database of Systematic Reviews via PubMed).
Q: Two power toothbrushes have the CDA Seal and no manual ones do. Doesn't that settle it? No, and it's a fair question. The seal validates claims a manufacturer chooses to submit: "manufacturers are required to state the oral health benefit(s) that they wish to have validated by CDA, and submit evidence to support their claim" (Canadian Dental Association). No manual toothbrush maker has applied (Canadian Dental Association), so the empty category shows who sought validation rather than which brush is better.
Q: I'm brushing my parent's teeth. Is an electric brush better for that? The research says it makes no clinical difference. A review of 16 publications found no difference in plaque or gum inflammation when a caregiver did the brushing, at a low level of evidence (Special Care in Dentistry via PubMed). If the person has dementia, the College of Dental Hygienists of Ontario cautions that "electrical appliances may disturb, or be a safety concern with, some persons with dementia" (College of Dental Hygienists of Ontario). Use whichever one lets you finish the job calmly.
Reviewed by Dr. Abinaash Kaur, B.Sc., DDS (University of Toronto Faculty of Dentistry), who has practised general and family dentistry in Bloor West Village for about 25 years. This article is general oral health information, not a diagnosis or a substitute for an examination.
Wondering whether your brushing is keeping up with your gums? Come in and we'll measure them, which is the only way to know whether you're holding steady or slowly losing ground, and show you the spots your brush keeps missing. We're at 750 Annette Street in Bloor West Village, serving the Junction, High Park, and Baby Point. Book a visit with The Village Dentist and we'll give you the real picture.
