Teeth whitening is one of the quickest ways to refresh your smile. Professional whitening, done by a registered dental professional, is faster and more effective than shop-bought kits. This guide explains how whitening works, what to expect, and what results are realistic.
Why choose professional whitening over shop-bought kits
Over-the-counter whitening products are less concentrated and less reliable than professional treatments. A dentist can check that your teeth are suitable for whitening — for example, to make sure cavities are filled first — and can use stronger, carefully controlled products. Professional whitening is also safer: your dentist protects your gums and soft tissues, reducing the risk of irritation. In the UK, only a registered dental professional can legally supply and apply tooth whitening products, so you can trust that treatment is done correctly.
How teeth whitening works
Whitening uses peroxide-based gels that bleach stains inside and on the surface of the tooth. The gel sits on your tooth and breaks down discoloured molecules. Stains from tea, coffee, red wine, tobacco or ageing can all fade. The longer the gel stays in contact with your tooth, and the stronger the concentration, the more whitening happens. Professional treatment uses higher concentrations than DIY kits, which is why results are usually visible after one or two sessions. However, some internal stains or discoloration caused by medication or trauma may not respond as well.
Take-home trays vs in-chair whitening
In-chair whitening: done at the practice in under an hour; often combined with a light or heat to speed up the process. Results are immediate and dramatic.
Take-home trays: custom-made trays filled with gel that you wear at home for a set time each day. Takes longer (usually 7–14 days) but is gentler and often cheaper. Your dentist makes sure the trays fit well to minimise gum contact.
Both methods are effective. Your dentist will recommend which suits you best based on your teeth, sensitivity and how quickly you want results.
What results can you expect?
Professional whitening can lighten teeth by several shades. Most people see noticeable change after one session; with take-home trays, improvement continues as you wear them. Results are not permanent — staining gradually returns over time, especially if you drink tea, coffee, red wine or smoke. With good home care (brushing, flossing) and avoiding heavy staining foods and drinks, results can last from a few months to a year or more. Some people have occasional touch-up sessions to maintain their brighter shade.
Teeth whitening at Pear Tree Dental, Nottingham
We offer both in-chair and take-home whitening. Before any treatment, we examine your teeth and gums to make sure whitening is safe for you. We check for cavities, existing fillings or crowns — these do not whiten, so we may discuss other cosmetic options if they are visible when you smile. We will also discuss sensitivity; if you have had problems with sensitive teeth before, we can recommend measures to minimise discomfort during whitening.
Next steps
To discuss teeth whitening and book a consultation, book an appointment or call 0115 931 2935. Learn more about cosmetic dental treatments at Pear Tree.
FAQ
Q: How long does professional whitening last? A: Results typically last a few months to a year, depending on your diet and lifestyle. Regular maintenance appointments can extend this. Heavy staining from tea, coffee, red wine or smoking will cause quicker relapse.
Q: Is teeth whitening safe? A: Professional whitening, applied by a dentist, is safe when done correctly. Sensitivity or mild gum irritation can occur but usually settle within a few days. It is important to follow your dentist's instructions and not exceed recommended exposure times.
Q: Will whitening work on crowns, veneers or fillings? A: No. Whitening only affects natural tooth structure. If you have visible crowns or fillings that are a different shade, your dentist may suggest replacing them after whitening or may recommend veneers or bonding as alternatives. Discuss your options at your consultation.
Q: I have sensitive teeth. Can I still whiten? A: Sensitivity and whitening can be managed together. Your dentist may suggest a lower-strength gel, shorter application times, or a desensitising treatment before and after whitening. It is important to mention sensitivity when you book so your dentist can prepare the right plan for you.