Teeth whitening: techniques, costs, and actual duration

1. What is teeth whitening?

Teeth whitening is a cosmetic treatment that removes surface and deep stains from the enamel, restoring a lighter, brighter color to the teeth.
It can be performed by the dentist (professional) or at home (domestic) with specific products.
Unlike over-the-counter whitening, professional whitening works in depth thanks to concentrated peroxides, always under clinical supervision.

2. Why teeth discolor

The main causes of yellowing are:

• Frequent consumption of coffee, tea, red wine and smoking .

• Natural aging of enamel.

• Use of antibiotics (tetracyclines) at a young age.

• Dental trauma or pulpal necrosis.

In many cases, whitening can restore the original brightness , but not completely change the natural color of the tooth.

3. Types of teeth whitening

Professional teeth whitening

It is performed in a dental office, under medical supervision. The most common techniques are:

• Teeth whitening with LED or plasma lamp: application of a gel based on hydrogen peroxide (25–40%), activated by light to accelerate the release of oxygen.
  Duration: 30–60 minutes per session.
  Result: up to 6–8 shades whiter.

• Laser teeth whitening: uses a laser light to activate the whitening gel with greater precision.
  Pros: fast, effective, suitable for deep stains.
  Cons: More expensive than other techniques.

• Internal whitening: indicated for root canal-damaged or trauma-related teeth. The gel is inserted inside the tooth .
  Cost: from €120 to €250 per tooth.

Home teeth whitening

It can be done at home, but with products prescribed or supervised by the dentist .
Includes:

• Customized whitening trays: low-concentration carbamide peroxide gel, to be worn 1–2 hours a day for 10–14 days.

• Whitening pen or whitening strips: convenient, but with temporary results (1–2 shades).

• Whitening toothpastes and mouthwashes: They only remove surface stains.

🧪 Average duration of results: 6–12 months, depending on dietary and hygiene habits.

4. How much does teeth whitening cost?

The price varies depending on the type of treatment:

💡 The best and safest results are always achieved under dental supervision , to avoid sensitivity or damage to the enamel.

5. Teeth Whitening at Home: Does It Really Work?

Home products offer visible but limited results .
Whitening gels, strips, and pens are helpful in maintaining the effect of professional whitening, but they cannot replace it.
Absolutely avoid uncontrolled “do-it-yourself” remedies , such as:

• Baking soda: too abrasive, can damage enamel.

• Lemon or vinegar: corrosive acids that weaken the tooth surface.

• Activated charcoal or bleaching powders: temporary effect but risk of microlesions.

👉 "Natural ingredients" don't mean they're safe. Always consult your healthcare professional before experimenting.

6. Best teeth whitening kit and effective products

Today there are new generation home kits, safer and clinically tested:

• Masks with LED light (low intensity, high concentration peroxide-free).

• Whitening pen with 6–10% carbamide peroxide.

• Gentle whitening toothpastes , with natural enzymes and fluoride.

🔍 When choosing a product, always check:

• Presence of EU authorization (EC or MDR) ;

• Peroxide content ≤ 0.1% for free use;

• Indication “clinically tested”.

7. How long does teeth whitening last?

On average, the effect of a professional treatment lasts 12–18 months , but can last up to 2 years if:

• Maintain proper daily oral hygiene;

• Avoid smoking and coloured drinks;

• Get regular check-ups with your hygienist.

The color tends to stabilize after a few weeks: it is normal for the teeth not to remain "optical white", but to maintain a natural and bright shade.

8. Teeth whitening: risks and contraindications

The treatment is safe when performed by professionals, but it can cause:

• Temporary sensitivity to cold or heat;

• Gum irritation if the gel comes into contact with soft tissue;

• Ineffective on fillings, crowns or veneers (do not change color).

It is not recommended during pregnancy, breastfeeding or in the presence of untreated cavities.

9. How to keep your teeth whiter longer

• Brush your teeth at least twice a day with a soft-bristled toothbrush.

• Use dental floss or interdental brushes daily.

• Reduce coffee, tea, red wine and smoking .

• Have a professional cleaning every 6 months .

• Drink colored drinks through a straw to reduce direct contact.

Scientific and reference sources

• Ministry of Health (Italy) – Guidelines for professional teeth whitening , 2024.

• American Dental Association (ADA) – Tooth Whitening: Guidelines and Clinical Safety , 2023.

• European Federation of Periodontology (EFP) – Tooth Whitening & Enamel Safety Report , 2023.

• Humanitas Research Hospital – Teeth Whitening: Techniques, Results, and Precautions , 2024.

• Journal of Dentistry (Elsevier) – Efficacy of different whitening agents and their impact on enamel , 2022.

• MyPersonalTrainer / Mondadori Media – Teeth Whitening: Everything You Need to Know , 2024 Scientific Review.