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The main difference is in speed and type of movement. A sonic toothbrush vibrates at very high frequencies (like thousands of oscillations per minute), while a regular electric one makes wider, slower movements - often rotating or going back and forth. In practice, the sonic is much faster and produces fine vibrations, almost like a buzzing sound, whereas you can actually feel the movement with the other type.
For cleaning, honestly the research says both clean better than a regular manual toothbrush. But the sonic tends to remove a bit more plaque, especially in the spaces between teeth, precisely because that rapid vibration generates microbubbles that reach difficult spots. A classic electric toothbrush has more "robust" movement and is easier to control if you're not experienced with electric ones. A lot of people find the sonic a bit irritating on sensitive gums at first.
Another thing: the sonic drains the battery faster and is generally more expensive. If you have normal gums and want to spend less, a good regular electric toothbrush works just fine. If you really want to maximize cleaning and can tolerate the strong vibrations, the sonic is worth it. It kind of depends on what your mouth is like and how patient you are with brushing.
What nobody really mentions is that a sonic toothbrush, because of how it vibrates, tends to create more aerosol in your mouth. If you have sensitive gums or bleeding issues, you risk making things worse because the super high frequency irritates more easily. A regular one is more "controlled" and less aggressive, even though it doesn't clean as deep.
Also, the battery thing matters a lot: sonics drain way faster because they consume a ton of energy. If you're always in a rush and forget to charge it, you end up using a dead toothbrush. Regular ones last longer between charges - they're slower but more reliable.
In the end it depends on your specific situation. If you have teeth and gums made of steel, the sonic wins. If you're the type who has sensitivity or inflammation, a basic electric one probably works better for you and your wallet will be happier too.
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