Teeth whitening is one of the most requested cosmetic dental treatments today — and for good reason. A brighter smile can dramatically improve confidence and first impressions. But with hundreds of products on the market making bold promises, it's hard to know what's safe and what actually works.
Professional vs. Over-the-Counter
Professional whitening treatments performed by your dentist use prescription-strength hydrogen peroxide gels (15–38%) that can lighten teeth by 6–10 shades in a single session. Over-the-counter strips and kits typically contain 3–10% peroxide and may take weeks to show comparable results — if they do at all.
The Science of Whitening
Tooth discolouration falls into two categories: extrinsic stains (on the surface, caused by coffee, tea, wine, and smoking) and intrinsic stains (within the tooth structure). Most whitening treatments target extrinsic stains through oxidation. For intrinsic discolouration, veneers or bonding may be more appropriate.
Safety Considerations
Temporary sensitivity is the most common side effect. Professional treatments are carefully calibrated to minimise this. Avoid whitening if you have untreated cavities, gum disease, or exposed roots — these must be addressed first. Always consult your dentist before beginning any whitening regimen.
Maintaining Your Results
Avoid staining foods and drinks for 48 hours after treatment. Use a whitening toothpaste for maintenance, stay hydrated, and schedule regular professional cleanings. Results typically last 12–18 months with proper care.
