(I) Aesthetics — No. 06
Teeth whitening: myths and facts
Whitening done under a dentist's supervision does not harm the enamel; but it does not lighten every tooth equally, and it does not last forever. Setting the right expectation is half of the result.
Whitening is one of the most asked-about, and most misunderstood, subjects in aesthetic dentistry. Here are the seven things we hear most often, and what is actually true.
“Whitening thins the enamel.”
Not true. Professional whitening works by breaking down colour molecules inside the tooth with peroxide-based gels; it does not wear the enamel away. What wears enamel is some of the harsh pastes and powders sold with a promise of whiteness.
“Every tooth whitens equally.”
Not true. Yellow tones usually respond well. Grey or bluish tones, some medication-related discolouration and root-canal-treated teeth may lighten less. That is why the starting shade is recorded at the examination, and expectations are set accordingly.
“Sensitivity means something went wrong.”
Usually not. Temporary sensitivity lasting a few days during and after whitening is common. Desensitising toothpastes and adjusting the intervals between applications help. Pain that is severe or does not go away should always be checked.
“My fillings and veneers will whiten too.”
Not true. Fillings, veneers and crowns do not change colour with whitening. A visible front filling may need replacing after whitening to match the new shade. If veneers are planned, whitening comes first.
“The result lasts forever.”
Not true. The effect can last a long time, but it is not permanent. Coloured drinks, smoking and time slowly bring colour back. Regular cleaning, and short touch-ups when needed, keep the result.
“Lemon and baking soda work just as well.”
Please don’t. Acidic mixtures soften the enamel, and combined with an abrasive like baking soda they can cause permanent wear. Whitening at home should be done with custom trays made by your dentist and suitable gels.
“No examination is needed before whitening.”
It is. Decay, exposed root surfaces, receding gums or cracks can make whitening painful or keep it from working as expected. A check-up comes first, and a professional clean if needed.
In short
On the right tooth, with the right method and the right expectation, whitening is one of the treatments that brings light to a smile with the least intervention.
Frequently asked
Does whitening damage teeth?
Whitening at a suitable concentration, supervised by a dentist, does not cause lasting damage to the enamel. Unsupervised, prolonged or unsuitable products, however, can cause sensitivity and irritate the gums.
How long does whitening last?
It varies from person to person. Tea, coffee, red wine and smoking bring colour back faster. With good care the effect lasts a long time; if needed, short touch-ups can be done with custom trays.
Do charcoal toothpastes whiten teeth?
Abrasive pastes can reduce surface stains but do not change the inner colour of the tooth. Used for long, they can wear the enamel and make the tooth look more yellow.
This page is for information. A diagnosis and a treatment plan require an examination.