Professional teeth whitening, called Zahnaufhellung or Bleaching in German, is a controlled process of lightening tooth colour using peroxides. In Germany it is performed by dentists or dispensed as a take-home system under dental supervision.
Key point: whitening works only on natural tooth structure. Fillings, crowns, and veneers do not change colour. If you have visible restorations on your front teeth, they may look different after whitening.
Three whitening methods
In-office bleaching
The dentist applies a hydrogen peroxide gel (up to 6% under EU regulations since 2012) to the teeth. Gums are protected with a barrier. The procedure takes 60-90 minutes. Immediate result: lightening by 3-8 shades on the VITA scale.
Home bleaching (dentist-supervised)
The dentist makes custom trays. The patient applies carbamide peroxide gel (10-16%) at home, wearing the trays 2-4 hours daily or overnight for 2-3 weeks. Gentler process, equally effective long-term.
Over-the-counter products
Whitening strips and gels from drugstores (dm, Rossmann). Peroxide concentration is limited to 0.1% in the EU for non-prescription products. Minimal effect, but safe.
EU regulation
Since 2012, products containing more than 0.1% and up to 6% hydrogen peroxide may only be applied by dental professionals in the EU. This protects patients from gum burns and enamel damage.
When whitening is not recommended
Untreated cavities or leaking fillings
Peroxide can penetrate into the cavity and cause severe pain. Treatment first, whitening second.
Pregnancy and breastfeeding
No evidence of harm exists, but German guidelines advise against whitening during this time as a precaution.
Under 18 years old
The pulp chamber is still enlarged in adolescents, increasing the risk of nerve irritation.
How long do results last?
With good care, results last 1-3 years. Coffee, tea, red wine, and smoking shorten the effect. A touch-up treatment can be done after 6-12 months.
Tips after whitening
🦷 First 48 hours: avoid staining foods (coffee, soy sauce, berries)
🪥 Use a soft toothbrush and sensitivity toothpaste
🚭 Do not smoke for at least 48 hours
💧 Drink staining beverages through a straw