For most people, we'd anticipate that they don't have anything to worry about in regard to Sonicare bristle stiffness. Oral-B and Sonicare are like two bickering children. If there was a proven risk for harm, there is no question in our mind that Oral-b advertising would bring it up.

On the Sonicare website we see this page that can be used to access studies they have conducted.
We limited the search using the following parameters and were served up a few studies that had evaluated this issue.
Product: Toothbrushes and heads.
Dental Indication: Gentleness

If you're really concerned, you might consider using a "sensitive" brush head and the "sensitive" setting on your brush. Also keep in mind that the way you brush with your Sonicare is an important factor too.

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