cosmetic-dentistry
What Is Teeth Whitening?
Last reviewed: May 2026 · Haute MD Editorial Team
Teeth whitening (tooth bleaching) uses peroxide-based bleaching agents — hydrogen peroxide or carbamide peroxide — to penetrate tooth enamel and oxidize organic compounds that cause discoloration. Professional in-office whitening (such as Zoom or KöR) uses higher concentration peroxide under dental supervision, producing results in 60-90 minutes. Take-home professional trays use lower concentrations over 1-2 weeks. Over-the-counter whitening products produce more modest results.
Types of teeth whitening
In-office professional whitening: the most dramatic single-session results. Hydrogen peroxide 25-40%, often light-activated. 2-8 shades lighter in one appointment. Take-home professional trays: custom trays made by your dentist, carbamide peroxide 10-22%, worn for 30 min to overnight for 1-2 weeks. Excellent results, lower cost than in-office. Over-the-counter strips and gels: hydrogen peroxide 3-10%, modest results, inconsistent fit. Whitening toothpastes: mechanical abrasion removes surface stains but do not bleach intrinsic discoloration.
What teeth whitening does not treat
Crowns, veneers, and tooth-colored fillings do not whiten — only natural tooth enamel responds to bleaching. Intrinsic staining from tetracycline antibiotics or fluorosis does not respond well to standard whitening — veneers are a more effective solution for these cases.
Frequently Asked Questions
How long does teeth whitening last?
Professional whitening results typically last 6-24 months depending on dietary habits, oral hygiene, and tobacco use. Coffee, tea, red wine, and tobacco stain teeth most significantly. Periodic touch-up whitening with take-home trays maintains results.
Does teeth whitening damage enamel?
Professional whitening used as directed does not permanently damage enamel. Temporary sensitivity is the most common side effect, typically resolving within 24-48 hours. Overuse of high-concentration whitening or whitening with existing enamel erosion increases sensitivity risk.
What is KöR whitening?
KöR Whitening is a professional whitening system considered the gold standard for difficult staining cases — particularly tetracycline staining — using refrigerated whitening gels and customized protocols. It produces results in cases that standard whitening cannot effectively treat.
Can I whiten veneers?
No. Porcelain veneers, crowns, and composite bonding do not respond to bleaching agents. Whitening will affect your natural teeth but not any existing dental restorations.
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