Juliana

When it comes to "whitening teeth" all any toothbrush can do is either: 1) Remove surface staining that has built up on the tooth's surface (accomplished by the actual scrubbing action of the brush on the teeth) or 2) Prevent surface staining from forming (prevent the build up of debris on the tooth's surface, which then stains - two separate events, that might occur concurrently).

As far as actually whitening teeth (changing the actual intrinsic color of the tooth's enamel) toothbrushes on their own do nothing.
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Any toothbrush can prevent tooth surface build up that might then stain, if you use it in a manner that effectively cleans your teeth.

To accomplish this with a Sonicare, you simply need to: 1) Pick a brush that has Sonicare's best brushing action (as discussed above), so this task is as easy for you as possible. 2) Use the brush until that point when you have effective cleaned your teeth (stop when your teeth are clean, not necessarily once the two minute timer has signaled).
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In terms of removing existing surface staining, Sonicare seems to imply (at least by the way they have named them) that some of their brushing modes have a superior ability to accomplish this task.

This discussion however relates how two Sonicare publications reported that two different models whitened teeth to the same degree, yet at that point in time when the separate studies were done, only one of the brushes actually featured a fancy whitening mode. The other just the standard 31,000 stroke/min mode.
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We take a pretty dim view of any and every toothbrush manufacturer who hawks their products based on their ability to "whiten" teeth.

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