How Professional Whitening Actually Works
Tooth discolouration happens in two ways: extrinsic (surface stains from coffee, tea, wine, tobacco) and intrinsic (discolouration within the tooth structure). Professional whitening targets intrinsic staining using hydrogen peroxide or carbamide peroxide gel — active ingredients that penetrate the enamel and oxidize the pigment molecules inside. This is fundamentally different from whitening toothpastes, which only address surface stains through mild abrasion.
5 Common Myths About Teeth Whitening
Let's clear up the most common misconceptions:
- Myth: Whitening damages enamel. Fact: Clinical whitening at correct concentrations is safe. Overuse of low-quality products is the real risk.
- Myth: Whitening works on crowns and veneers. Fact: Whitening only affects natural tooth enamel. Existing restorations won't change colour.
- Myth: Results last forever. Fact: Results typically last 1–3 years depending on diet and habits.
- Myth: Pharmacy strips work as well as professional treatment. Fact: They contain far lower concentrations and only address surface stains.
- Myth: Sensitivity means something is wrong. Fact: Temporary sensitivity is normal and resolves within 48 hours of treatment.
Who is a Good Candidate?
Most adults with healthy teeth and gums are excellent candidates. Whitening works best on yellow and brown staining from food, drink, and ageing. It is less effective on grey staining from medications (like tetracycline). Whitening is not recommended for patients who are pregnant, have active gum disease, severe enamel erosion, or extensive restorations on front teeth.
In-Clinic vs Take-Home Whitening
In-clinic whitening delivers the fastest, most dramatic results — typically 6–10 shades in a single 60-minute appointment. We use professional-grade gel activated under a whitening light. Take-home trays (custom-fitted whitening trays with professional-grade gel) work equally well but over 2–3 weeks. Many patients combine both for optimal results.
Maintaining Your Results
The lifestyle factors that stain teeth in the first place — coffee, tea, red wine, tobacco — will gradually restain even whitened teeth. To maintain results: rinse immediately after consuming staining foods and drinks, use a whitening toothpaste for daily maintenance, and do a top-up whitening treatment every 12–18 months.
If you want noticeably whiter teeth safely and effectively, professional whitening is the gold standard. A consultation takes 15 minutes and allows us to assess your suitability, show you what results are achievable, and create a whitening plan that fits your lifestyle.