Teeth Whitening Process
An overview of professional and at-home teeth whitening methods.
Professional teeth whitening uses concentrated hydrogen peroxide or carbamide peroxide gels to break down stain molecules within the tooth enamel and dentin. In-office treatments typically use higher concentrations (25-40% hydrogen peroxide) with light or laser activation for faster results. The procedure takes about 60-90 minutes and can lighten teeth by several shades in a single session. Take-home whitening kits prescribed by dentists include custom-fitted trays and lower-concentration gels (10-22% carbamide peroxide) for gradual whitening over one to two weeks. This approach offers more control over the whitening process and can be more comfortable for patients with sensitive teeth. Both methods are safe when supervised by a dental professional. Common side effects include temporary tooth sensitivity and mild gum irritation. Results typically last six months to two years depending on dietary habits and oral hygiene. Touch-up treatments can extend the results, and avoiding stain-causing foods and beverages helps maintain brightness.