Electric toothbrushes range from inexpensive battery models to high-end rechargeable ones, and the question we hear most is simple: are they actually better? The best summary of the evidence comes from a Cochrane systematic review, which pooled dozens of randomized trials. This guide explains what it found, its limits, and what matters more than the type of brush.
What the Cochrane review looked at
Cochrane reviewed randomized controlled trials comparing powered and manual toothbrushes in everyday, unsupervised use for at least four weeks, in children and adults. Its evidence is current to January 2014. It included 56 trials published between 1964 and 2011, with 5,068 participants; 51 trials, involving 4,624 participants, provided data for its meta-analysis. Most studies involved adults, and more than half used rotation-oscillation brushes, whose heads rotate one way and then the other.
What it found
According to Cochrane’s summary, powered brushes outperformed manual ones on two measures:
- Plaque: an 11% reduction at one to three months of use, and a 21% reduction after more than three months.
- Gingivitis (gum inflammation): a 6% reduction at one to three months, and an 11% reduction after more than three months.
Cochrane rated this evidence as moderate quality. Few studies reported side effects, and those reported were local and temporary.
What it did not show
The review is often summarized as “electric is better,” but the details matter:
- Long-term benefit is unclear. Cochrane states that the benefits for long-term dental health are unclear. The trials measured plaque and gum inflammation over weeks and months, not tooth loss or cavities over years.
- Results varied a lot between studies. Cochrane reported high heterogeneity that was not explained by the type of powered brush.
- Most trials had unclear risk of bias. Of the included trials, Cochrane classed five as low risk of bias, five as high and 46 as unclear.
- The evidence is not current. Today’s brushes may differ from those tested.
So the fair reading: on average, powered brushes removed somewhat more plaque and reduced gum inflammation somewhat more in these trials, but good technique with a manual brush remains effective.
Who might benefit most from an electric brush
These are practical considerations rather than findings from the review:
- People with limited hand dexterity, such as those with arthritis.
- People with braces or other appliances that make brushing harder.
- People who tend to brush too briefly; many models have built-in timers.
- People who press too hard; some models include pressure sensors.
- Kids who are more motivated by a powered brush.
What matters more than the brush
Fluoride toothpaste
The ADA explains that fluoride strengthens enamel and helps repair early acid damage (ADA MouthHealthy). Whatever brush you use, use fluoride toothpaste. See our fluoride guide.
Twice a day, every surface
Plaque is removed by contact. Cover outer, inner and chewing surfaces and the gumline, and do not rush.
Clean between teeth
No toothbrush cleans fully between teeth. Floss, interdental brushes or a water flosser fill that gap. This is especially important for gum health; see gum disease signs.
Gentle pressure, soft bristles
Scrubbing hard can irritate gums. With a powered brush, guide it slowly and let it do the work.
Replace heads and brushes
Replace when bristles fray, and after illness if you prefer.
Regular checkups
Your hygienist can show you missed spots, which is the most personalized feedback on technique you will get. See how often to see the dentist.
Choosing a brush
- Pick soft bristles and a head size that reaches your back teeth.
- For powered brushes, consider a timer, pressure sensor, battery life and the ongoing cost of replacement heads.
- Look for the ADA Seal of Acceptance if you want an independent check of a product’s claims.
- The best brush is the one you will use well, twice a day.
Not sure what to change? Ask at your next visit. Find a dentist near you in our directory.
Frequently asked questions
Are electric toothbrushes better than manual ones?
A Cochrane review found powered brushes reduced plaque and gingivitis more than manual brushes in the short and longer term, with moderate-quality evidence. Long-term benefits for dental health are unclear.
How much more plaque does an electric toothbrush remove?
Cochrane reported an 11% reduction in plaque at one to three months and 21% after more than three months, compared with manual brushing.
Is a manual toothbrush still fine?
Yes. Good technique, fluoride toothpaste, cleaning between teeth and regular checkups matter a great deal whichever brush you use.
Are electric toothbrushes safe for gums?
In the Cochrane review, few studies reported side effects, and those reported were local and temporary. Use gentle pressure.
Who benefits most from an electric toothbrush?
People with limited dexterity, braces, or a habit of brushing too briefly or too hard may find features like timers and pressure sensors helpful.
Photo: Polina Zimmerman / Pexels
Sources
By the Dentist Review Editorial Team.
This is general information, not medical advice. Talk to a licensed dentist about your own situation. See our disclaimer.
