How Do Whitening Strips Work?
Whitening strips look almost too simple to do anything - a thin, flexible film you press onto your teeth. But there's real chemistry happening underneath. Here's how they actually work, in plain English.
The science in one paragraph
Most whitening strips are coated with a peroxide gel - usually hydrogen or carbamide peroxide. When it sits against the tooth, the peroxide releases oxygen that works its way into the enamel and breaks apart the larger molecules responsible for staining. Smaller molecules reflect light differently, so the tooth looks brighter. Nothing is scraped off; the stain compounds are essentially broken down where they sit.
Surface stains vs deeper discolouration
There are two kinds of staining. Extrinsic stains sit on the surface - the coffee, tea, wine and tobacco residue that builds up day to day. Intrinsic discolouration lives deeper in the tooth and can come from age, certain medications, or genetics. Peroxide strips are best at the surface and upper layers; deep intrinsic discolouration is harder to shift and is worth discussing with a dentist before you expect dramatic change.
Made by Vantura — the Purple Whitening Strips.
See the product →What a strip is actually made of
A flexible backing that moulds to the curve of your teeth.
An active gel layer - the peroxide (or, in purple strips, a colour-correcting agent).
An adhesive that holds it in contact long enough to do its job.
That contact time is the whole point - it's why you leave strips on for a set number of minutes rather than wiping the gel on and off.
Where purple strips differ
Purple works on a different principle. Instead of relying solely on bleaching, a purple tone sits on the colour wheel opposite yellow, so it visually neutralises yellow undertones - the same optics behind purple shampoo for blonde hair. The result is an immediate brightening effect that's gentle on enamel. Our Purple Whitening Strips are built around this, and we break down the approach in purple whitening strips, explained.
Frequently asked questions
Do strips damage enamel?
Used as directed, quality strips are generally considered safe. Overuse or leaving them on too long is what raises the risk of sensitivity - more isn't better.
Why do my teeth feel sensitive afterwards?
Temporary sensitivity is the most common side effect of peroxide. It usually settles; if it doesn't, ease off and check with your dentist.
Will strips whiten crowns or veneers?
No. Whitening only works on natural enamel, not on dental work.
Purple Whitening Strips
Purple colour-correcting whitening strips — a visibly brighter smile without the peroxide zing.
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This article is for general educational purposes and isn't a substitute for advice from your dentist or doctor. If you have dental work, deep discolouration, or ongoing sensitivity, consult a dental professional before whitening.