Both types clean more thoroughly than a manual toothbrush. In a large review by the Cochrane Collaboration, electric toothbrushes removed around 21% more plaque after more than three months and reduced gum inflammation by around 11%. Oscillating-rotating brushes have been studied the most. The studies do not show that one type is clearly better. More important than sonic or oscillating are your technique and two features of the device: a pressure sensor and a two-minute timer. You can happily choose the one that feels better to you.
Updated: 9 November 2026
How the two work
- Sonic toothbrush: an elongated head whose bristles vibrate back and forth very quickly. The movement also creates a flow of saliva and toothpaste that reaches just into the spaces between the teeth.
- Oscillating toothbrush: a small round head that turns quickly back and forth, on many models with an additional pulsing. It cups each tooth individually.
How to brush properly
- With a sonic toothbrush: place the head at an angle where tooth meets gum and move it slowly from tooth to tooth. Do not scrub: the brush does the movement.
- With an oscillating toothbrush: guide the round head from tooth to tooth and pause briefly at each one, outer, inner and biting surface.
- With both: two minutes, little pressure, around 30 seconds for each quarter of your mouth.
What to look for when buying
- Pressure sensor: it warns you when you press too hard. That protects your gums and tooth necks.
- Timer: two minutes, with a short signal every 30 seconds.
- Soft brush heads, replaced every three months or sooner if the bristles splay.
An app, brushing modes, sensors and a battery that lasts a week of travel are a nice bonus, but not decisive for healthy teeth.
What no toothbrush can do
Even the best toothbrush only reaches the edges of the spaces between your teeth. That is where decay and gum inflammation most often begin. Clean them once a day with interdental brushes or floss. Which suits where is explained in “Floss or interdental brushes?”. Dental hygiene does the rest: it removes plaque at and below the gum line too, where no brush reaches at home.
