Teeth whitening is an excellent way to achieve the pearly whites of your dreams. However, like every other dental treatment, its effects do not last forever and require consistency to prolong longevity.
On average, in-chair teeth whitening lasts about 2-3 years. But you can have whiter teeth longer by listening to your dentist’s instructions and doing your own touch-up whitening at home or in the clinic.
What is teeth whitening?
Teeth whitening is a cosmetic procedure that uses a bleaching agent to lighten the color of teeth. It does not turn teeth completely brilliant white, but it can lighten teeth by several shades.
There are two main types of teeth whitening:
- In-office teeth whitening: Done by a dentist using a higher concentration of bleaching agent.
- At-home teeth whitening kits: Available over-the-counter or from your dentist, using a lower concentration of bleaching agent.
How is teeth whitening done?
Professional teeth whitening can be done in a dentist’s office in about an hour. The dentist will apply a teeth whitening gel containing about 25-40% hydrogen peroxide, then aim a special lamp at your teeth for three 20-minute intervals. The gel will be reapplied between intervals. Some dentists may also use lasers to accelerate the process. A protective barrier is used to keep your lips, gums, and tongue away from the gel.
After the procedure, your dentist will provide custom-made whitening trays for follow-up touch-ups at home.
Steps involved in professional teeth whitening:
- Taking impressions of your teeth to create custom whitening trays.
- Applying a protective barrier to gums and lips.
- Applying whitening gel to the teeth.
- Placing whitening trays over the teeth.
- Activating the gel with a special lamp.
- Leaving the lamp on for 20-minute intervals (usually repeated three times).
- Removing the trays and protective barrier.
- Polishing the teeth.
Can I whiten my own teeth at home?
While many over-the-counter products exist, they are often not regulated and may contain harmful levels of peroxide. If you consider whitening at home, talk to your dentist first to ensure the product is safe for your enamel.
Risks of at-home whitening:
- Tooth sensitivity: Temporary but uncomfortable reaction to peroxide.
- Gum irritation: Peroxide can cause mild to severe irritation if it touches the gums.
- Enamel damage: Rare cases can lead to weakened enamel, making teeth prone to decay.
How long does teeth whitening last?
Results typically last 2-3 years, but you can prolong the effects by:
- Avoiding staining foods: Limiting coffee, tea, red wine, and berries.
- Brushing and flossing: Maintaining strict oral hygiene to prevent plaque buildup.
- Using whitening toothpaste: Helping remove surface stains daily.
- Professional touch-ups: Visiting your dentist every few years for maintenance.
Who is teeth whitening not suitable for?
- Intrinsic stains: Deep stains caused by genetics or medication that bleaching cannot reach.
- Trauma: Teeth with cracks where gel could irritate exposed dentin.
- Decay or Gingivitis: Whitening should wait until oral health issues are resolved.
- Orthodontic treatment: Braces or aligners can lead to uneven whitening or damage to the appliance.
Conclusion
Teeth whitening is a great way to boost your smile, but it requires maintenance. By following professional advice and maintaining good habits, you can enjoy a brighter smile for years to come.
References
- Channel News Asia – DIY Teeth Whitening Warnings
- Cvikl, B., et al. (2016). Enamel surface changes after exposure to bleaching gels. Operative dentistry.
