Professional Teeth Whitening in London

A bright, white smile can instantly boost your confidence. At Thousand Smile, we provide safe and effective teeth whitening treatments designed to remove stains and lighten discolouration without damaging your teeth. Whether you’re preparing for a big event or simply want to refresh your look, our professional whitening treatments deliver noticeable results.

Do Teeth Lose Their Whiteness second image

Why Do Teeth Lose Their Whiteness?

Over time, it’s natural for teeth to become discoloured. Common causes include:

Ageing – enamel wears down, exposing the dentin underneath
Smoking or tobacco use
Drinks like red wine, coffee, tea, and cola
Certain medications
Poor oral hygiene

No matter the reason, our professional whitening treatments can restore brightness to your smile.

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Who Is Teeth Whitening Suitable For?

Who Is Suitable for Teeth Whitening explained by Thousand Smiles Dental Clinic

You may be a good candidate if you:

Are aged 18 or older
Have healthy gums and natural teeth
Want to remove staining or lighten the overall shade of your teeth

Whitening is not recommended if you are pregnant or breastfeeding. It’s also important to note that dental restorations (veneers, crowns, bridges, dentures, and fillings) will not change colour. If your teeth are heavily restored, other cosmetic options such as veneers or composite bonding may be more suitable.

At Thousand Smile, every patient starts with a consultation to confirm suitability and discuss the best whitening option for their needs.

Ready to begin your Invisalign journey?
Call Thousand Smiles today on

020 3773 2280

Our Teeth Whitening Options

We offer both in-practice whitening for immediate results and at-home whitening for convenience.

In-Practice Whitening

Carried out by a qualified dentist
Can lighten teeth by up to six shades in just one hour
Uses a professional-strength gel activated by a special blue light
Perfect if you want fast results before an important event

At-Home Whitening

Includes custom-made trays and whitening gel
Typically worn overnight for a few weeks
Gradually whitens teeth at your own pace
Can be used as a top-up after in-practice treatment

Internal Whitening (for root-treated teeth)

If a tooth has darkened following root canal treatment, our dentist may recommend internal bleaching. Whitening gel is placed inside the tooth and sealed with a temporary filling. The process is repeated over a couple of visits until the tooth lightens, after which it is permanently restored with a tooth-coloured filling.

Aftercare and Maintenance

To keep your smile whiter for longer, we recommend:

Brushing twice daily with fluoride toothpaste
Flossing daily to remove plaque and debris
Limiting coffee, tea, red wine, and dark foods that stain
Avoiding or reducing smoking
Scheduling regular hygienist visits for professional cleaning
Using whitening top-up kits if needed

With the right care, results can last 18–24 months.

Cost of Teeth Whitening

The cost of whitening depends on the method you choose:

At-home whitening kits

Usually more affordable

In-practice whitening

Higher cost, but immediate and dramatic results

Your consultation will include a breakdown of costs tailored to your treatment plan.

Why Choose Thousand Smile?

Safe treatment – performed only by General Dental Council (GDC) registered professionals
Advanced technology – including Philips ZOOM whitening, which can make teeth up to six shades lighter
Flexible options – both quick in-practice results and convenient at-home kits
Personalised care – treatments tailored to your smile goals

020 3773 2280