What is teeth whitening?
Teeth whitening is a cosmetic dental treatment that lightens the color of your teeth by removing stains and discolouration. It’s one of the most popular ways to quickly improve a smile.
Why Do Teeth Get Stained?
Common causes include:
- Coffee, tea, red wine, cola and dark foods
- Smoking or chewing tobacco
- Natural aging - enamel thins, dentin shows through
- Some medications (e.g. certain antibiotics)
- Poor oral hygiene
Types of Teeth Whitening
1. Professional (In-Office) Whitening
- Done at the dental clinic
- Dentist applies a high-strength bleaching gel (usually hydrogen peroxide)
- Sometimes combined with a special light or laser to boost results
- Takes about 1 hour
- Can lighten teeth several shades in a single visit
2. Professional Take-Home Whitening Kits
- Custom trays made to fit your teeth
- You wear the trays with a whitening gel for a set time daily (usually 1–2 weeks)
- More gradual than in-office, but very effective
3. Over-the-Counter (OTC) Whitening
- Whitening strips, pens or generic trays
- Less powerful than professional options
- Results vary - slower and less dramatic
Benefits of Professional Whitening
- Fast results
- Even whitening
- Supervised by a dentist - safer for teeth and gums
- Stronger whitening agents than store-bought products
Possible Side Effects
- Temporary tooth sensitivity (common)
- Mild gum irritation if gel touches soft tissue
- Overuse or misuse of OTC kits can damage enamel
Who Can Whiten Their Teeth?
Most adults with healthy teeth and gums are good candidates. Whitening is not recommended for:
- Children
- Pregnant women
- People with untreated dental issues
Note: Whitening only works on natural enamel - it won’t change the colour of crowns, fillings or veneers.
How Long Does Whitening Last?
Results can last from several months to a few years, depending on:
- Diet and lifestyle (e.g. coffee, smoking)
- Oral hygiene
- Touch-up treatments
Tip: Using a straw for dark drinks, brushing regularly and avoiding tobacco can help maintain your results longer.
