What to Expect, How Much It Costs & Where to Go

Professional whitening isn’t just about aesthetics — it’s about doing it safely, with results that last.

You’ve probably noticed it. A photo where your smile doesn’t quite look the way you imagined it would. Or maybe you’ve been thinking about it for months — your teeth just aren’t as bright as they used to be, and no amount of whitening toothpaste has made any real difference.

You’re not alone. Tooth discolouration is one of the most common cosmetic concerns we see at our Croydon dental practice — and for most people, the solution is simpler, safer, and more affordable than they expect.

This guide answers everything Croydon patients ask us about teeth whitening: what causes staining, whether professional treatment is worth it, what it actually costs, and how to get started. No hype, no exaggeration — just honest information so you can make the right decision for your smile.

Quick answer: Professional teeth whitening is one of the fastest, most effective cosmetic treatments available. Most patients see results 4–8 shades lighter after a single course of treatment — with results that can last 1–2 years.

Why do teeth become discoloured in the first place?

Before we talk about whitening, it helps to understand why teeth stain at all. There are actually two types of tooth discolouration — and they respond differently to treatment.

Extrinsic staining (surface stains)

This is the most common type. It affects the outer layer of the tooth (enamel) and is caused by what you consume. Coffee, tea, red wine, cola, and certain foods like curry and soy sauce are the usual culprits. Smoking is one of the biggest contributors too — nicotine and tar leave stubborn yellow-brown stains that build up over time.

Intrinsic staining (deeper discolouration)

This type is harder to treat because it occurs within the tooth structure itself. It can be caused by ageing (dentine naturally darkens as we get older), certain antibiotics taken in childhood like tetracycline, fluorosis from excessive fluoride during tooth development, or trauma to the tooth.

Professional whitening works brilliantly on extrinsic staining and many cases of intrinsic discolouration. Your dentist will assess your teeth before recommending a treatment to make sure you’re a good candidate — which is something no online kit or supermarket product can do.

Professional whitening vs. over-the-counter products: what's the real difference?

This is probably the question we get asked most. And the honest answer is — there’s quite a big difference.

Over-the-counter whitening products like whitening strips, kits from Amazon, or “whitening” toothpastes are legally restricted to very low concentrations of hydrogen peroxide (0.1% in the UK). That’s not nearly enough to create meaningful whitening for most people.

Professional dental whitening uses clinically approved products at higher concentrations — applied safely and monitored by a qualified dental professional. In the UK, only registered dental professionals can legally provide teeth whitening treatment using concentrations above 0.1% hydrogen peroxide.

According to the General Dental Council (GDC), teeth whitening is a dental procedure and must only be carried out by a registered dental professional or under their prescription. Beauty salons and non-dental providers offering whitening are acting illegally — and risking your oral health.

What professional teeth whitening at iCare Dental Croydon involves

Consultation and shade assessment

One of our dentists examines your teeth, takes a shade reading, and confirms you're a good candidate. We check for existing decay, sensitivity, or restorations that may affect treatment.

Professional clean (if needed)

For best results, teeth should be plaque and tartar free first. We often recommend a hygienist appointment beforehand to maximise whitening effectiveness.

Custom tray impressions

We take impressions to create precisely fitted trays for your mouth — far more effective than generic one-size kits, and gentler on gums.

Wear trays at home

You apply professional-strength whitening gel to your trays and wear them for 30–60 minutes daily, or overnight. Most patients complete a full course over 2–3 weeks.

Review and top-up guidance

We review your results and advise on maintaining your new shade. You keep your custom trays, making future top-ups simple and cost-effective.

How much does teeth whitening cost in Croydon?

Teeth whitening is not available on the NHS — it’s considered a cosmetic treatment. If you’re searching for teeth whitening near Croydon and want an exact quote, the best first step is a consultation so we can assess your teeth personally.

How long do whitening results last?

Most patients with professional whitening maintain results for 12 to 24 months before needing a top-up. How long yours last depends on a few key factors:

Because you keep your custom-made trays, refreshing your whitening at home in the future is very straightforward — and much more affordable than starting from scratch.

Is teeth whitening safe? And what about sensitivity?

Professional teeth whitening, carried out correctly by a qualified dentist, is a well-established and safe treatment. The active ingredients — hydrogen peroxide or carbamide peroxide — have been used in clinical dentistry for decades.

Some patients do experience temporary sensitivity during or after treatment, particularly to hot or cold. This is completely normal and usually resolves within a day or two. If you already have sensitive teeth, your dentist may recommend a lower concentration gel or a desensitising treatment alongside whitening.

The NHS advises seeking professional dental advice before undergoing any whitening treatment — and we strongly agree. A proper assessment protects you from unnecessary risks and ensures the best possible outcome.

Important: If you have crowns, veneers, bridges or white fillings on visible teeth, discuss this with your dentist before whitening. Whitening gel does not change the colour of restorations — so existing dental work may become more noticeable if your natural teeth whiten around them.

Who we serve around Croydon

iCare Dental Croydon is centrally located and regularly sees patients from across the local area — including South Croydon, East Croydon, Purley, Thornton Heath, Addiscombe, Shirley, Norwood, Selsdon, and Waddon. If you’ve been searching for “teeth whitening near me” in the CR0 postcode or surrounding areas, our practice is convenient to reach with flexible appointment times.

We welcome both new and existing patients for whitening consultations — you don’t need to be an existing patient to book.

How does whitening compare to other cosmetic treatments?

Whitening is one of the most cost-effective cosmetic dental treatments available — but it’s not always the right solution on its own. If your main concern is colour and brightness, whitening is the ideal starting point. However, if you’re also looking to address chips, gaps, or shape, you might benefit from dental veneers or a full smile makeover.

If alignment is also a concern, we offer Invisalign clear braces in Croydon — and many patients choose to whiten after completing their Invisalign treatment for a complete smile transformation. Explore our full cosmetic dentistry range to see what’s possible.

Image: Patient in chair — friendly Croydon dental practice setting