How Does Teeth Whitening Work?

Whites Dental Waterloo

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Whites Dental Marble Arch (W2)

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Teeth whitening plays a significant role in creating a beautiful smile. Professional teeth whitening is increasingly popular among both men and women in London, with more people choosing cosmetic dentistry to enhance their appearance and boost self-confidence.

Many new patients ask us about professional teeth whitening, veneers, composite bonding and similar cosmetic treatments — but whitening is by far the most requested. At Whites Dental, our cosmetic dentists offer a range of professional whitening options, including Philips Zoom home whitening, Enlighten whitening, and Zoom in-surgery laser whitening. These systems are designed to safely and effectively brighten your smile — transforming confidence and helping you feel great about your teeth.

How Teeth Get Stained

To understand how teeth whitening works, it helps to know how stains form. Each tooth is made of three layers — pulp, dentin and enamel. Enamel, the outermost layer, protects the tooth and is where stains typically develop.

A thin pellicle film naturally forms from food and drink intake, which can trap stains. This film can be removed during a hygiene appointment, but if left for too long, staining agents may penetrate the enamel — which is porous — and cause deep discolouration. These stains are usually harmless, but can appear unsightly. That’s where a good whitening system comes in — to restore your enamel’s brightness and lift those deeper stains.

What Causes Teeth Stains?

Almost anything you put in your mouth has the potential to stain your teeth. Common culprits include:

As a rule of thumb — if something can stain your clothes, it can stain your teeth.

What Do Professional Dentists Use to Whiten Teeth?

Teeth whitening works by using safe chemicals that penetrate enamel and oxidise stains — breaking them down and restoring brightness. There are two types:

Zoom Instant In-Surgery Whitening

This in-clinic treatment takes around 90 minutes. After cleaning the teeth and protecting the gums, your cosmetic dentist will apply a high-strength peroxide gel. An LED light may be used to activate the whitening process, speeding up results. The gel is applied and removed in several cycles, leaving you with visibly whiter teeth in just one session.

At-Home Whitening

For patients who prefer to whiten gradually at home, we offer custom-fitted whitening trays and gel. After an assessment, your dentist will provide everything you need. Simply wear the trays overnight for around two weeks to achieve excellent results — all from the comfort of your own home.

Is Teeth Whitening Safe?

Yes — when done correctly, teeth whitening is considered very safe. However, like all dental treatments, some side effects can occur:

According to the Academy of General Dentistry, whitening does not affect crowns, implants, or white fillings — although white fillings may appear slightly lighter after treatment.

Find the Best Cosmetic Dentist in London

The first step to achieving a whiter smile is finding a cosmetic dentist you trust. At Whites Dental, we work with some of the leading cosmetic dentists in London, offering a range of safe and effective whitening treatments. Whether you’re interested in Zoom laser whitening, Enlighten home kits or Zoom home whitening, we’re here to help.

We are based in London Waterloo, just 1 minute from Southwark station and within 10 minutes of London Bridge, Borough, Blackfriars, Southbank, and Elephant & Castle.

Visit our teeth whitening homepage to learn more or book a consultation to discuss your options with our expert team.