Key Takeaways
- Professional teeth whitening carried out under dental supervision is safe and effective
- The most common side effect is temporary sensitivity, which settles quickly and isn’t harmful
- Shop-bought and online kits are unregulated, often unlicensed, and can cause uneven results or damage to gums
- Whitening only works on natural teeth; fillings, crowns, and veneers won’t change colour
- At Nonsuch Park Dental in Cheam, professional take-home whitening starts from £385
- With good oral hygiene, results typically last up to 18 months before slight regression is noticed.
- The best first step is a consultation. Whitening isn’t suitable for everyone, and it’s worth checking before you start
It’s one of the most Googled dental questions out there, and understandably so. With whitening strips, overnight trays, charcoal toothpastes, and LED kits all over social media, it can be hard to know what’s genuinely safe and what’s just clever marketing.
So let’s cut through it. Here’s a straightforward, honest answer from Dr Tobi on everything you need to know before you whiten your teeth.
Is teeth whitening actually safe?
Yes, when it’s done properly.
Professional teeth whitening carried out under dental supervision is a safe, well-established treatment. In the UK, only registered dental professionals are legally permitted to provide whitening treatments containing more than 0.1% hydrogen peroxide. That legal framework exists for good reason: it ensures that anyone offering whitening has assessed your teeth first, is using clinically appropriate products, and is supervising your treatment throughout.
The key phrase there is under dental supervision. That’s what separates professional whitening from the unregulated products you’ll find online or on the high street, and it’s the difference between safe, predictable results and potential damage.
What does professional teeth whitening involve?
At Nonsuch Park Dental, we use a take-home whitening system, and it’s more straightforward than most people expect.
Before anything else, Dr Tobi will check that your teeth and gums are healthy and suitable for whitening. This step matters. Whitening on unhealthy teeth or irritated gums can cause problems, so we always start here.
If you’re a good candidate, we take impressions of your teeth to create custom-fitted whitening trays. These are made precisely to the shape of your mouth, which is important for both comfort and results. You’ll take the trays home along with professional-strength whitening gel and clear instructions.
You wear the trays each night or for a short period each day. Over two to four weeks, your teeth gradually become brighter but most people see results within a week. Because the trays are custom-made, the gel stays where it should, against your teeth, not your gums, which minimises sensitivity and gives you an even, natural-looking result.
What are the side effects?
The most common side effect of teeth whitening is temporary sensitivity. Some patients notice their teeth feel a little more sensitive to hot, cold, or sweet things during treatment. This is normal and almost always settles once the whitening course is complete.
Using custom-fitted trays and professional-grade gel, rather than generic strips or one-size trays, significantly reduces the likelihood and intensity of sensitivity. It’s one of the reasons professional whitening is worth doing properly.
Gum irritation can also occur if whitening gel makes contact with the gums, but again, custom trays are specifically designed to prevent this.
There are no long-term safety concerns associated with professionally supervised teeth whitening when it’s carried out correctly.
Does teeth whitening actually work?
Yes, though results vary depending on your natural tooth colour and the type of staining you have.
Professional whitening is most effective on surface stains caused by food and drink: coffee, tea, red wine, and certain foods are the usual culprits. Most patients see a noticeable improvement of several shades, and the results look natural rather than artificial.
It’s worth knowing that whitening gel only works on natural tooth enamel. It won’t change the colour of fillings, crowns, or veneers. If you have visible restorations, Dr Tobi will advise on the best approach to achieve an even result; sometimes this means whitening first and then replacing any restorations to match your new shade.
Whitening is also less effective on certain types of intrinsic discolouration — staining that originates from inside the tooth, such as that caused by certain antibiotics or trauma. In those cases, there may be better alternatives, such as composite bonding or veneers, which Dr Tobi can talk you through.
How much does teeth whitening cost?
Professional teeth whitening at Nonsuch Park Dental in Cheam starts from £395. This includes your custom-made trays and professional whitening gels, everything you need to complete your treatment at home.
It’s worth comparing this against the cost of shop-bought kits, which can run from £20 to £100 or more and often deliver disappointing or uneven results. When you factor in the clinical assessment, the custom trays, and the quality of the gel, professional whitening represents a much better investment for lasting results.
We also offer membership plans and interest-free finance to help manage the cost of your dental care, speak to our reception team for details.
What about shop-bought whitening kits?
This is where we need to be direct with you.
Shop-bought and online whitening kits, strips, overnight trays, LED devices, and charcoal products are not the same as professional whitening. In the UK, over-the-counter products are legally limited to 0.1% hydrogen peroxide, which is not enough concentration to produce meaningful whitening results.
Products sold online, particularly those imported from outside the UK or EU, are often unregulated and unlicensed. They may contain higher concentrations of bleaching agents than are legally permitted, which can cause gum damage, uneven results, and increased sensitivity, sometimes significantly so.
The short version: if something seems too cheap or too easy, it probably isn’t the safe, effective solution it’s claiming to be. Professional whitening exists precisely because doing this properly matters.
Who isn’t suitable for teeth whitening?
Teeth whitening isn’t suitable for everyone, which is exactly why a proper assessment matters before you start. Whitening may not be recommended if:
- Your gums are inflamed, or you have active gum disease
- You have significant tooth decay that hasn’t been treated
- You are pregnant or breastfeeding
- You are under 18
- You have significant visible restorations in your smile zone that won’t respond to whitening
None of this means you can’t improve your smile — it just means the approach might be different. Dr Tobi will always give you an honest assessment and point you toward the right treatment for your situation, whether that’s whitening, composite bonding, a smile makeover, or something else entirely.
How long do results last?
With good care, teeth whitening results typically last 18 months. The main things that affect longevity are diet (how much coffee, tea, red wine, and staining foods you consume), smoking and oral hygiene.
Top-up treatments are available when needed, and because you keep your custom trays, future top-ups are simple and more affordable.
Ready for a brighter smile?
If you’re based in Cheam, Sutton, Ewell, Epsom or the surrounding areas and you’re thinking about professional teeth whitening, the best place to start is a conversation with Dr Tobi.
You can find out everything you need to know about teeth whitening at Nonsuch Park Dental, or book a consultation online, and we’ll take it from there. No pressure, no obligation, just an honest chat about whether whitening is right for you and what results you can realistically expect.