Tooth sensitivity is the most common side effect of teeth whitening. Many people notice short, sharp sensations during or after treatment, especially when eating or drinking something cold. While this can be uncomfortable, it is usually temporary and manageable. This article explains why sensitivity happens during whitening, how long it should last, and what you can do to reduce it.
Teeth whitening works by using peroxide-based gels to break down stain molecules inside the tooth. During this process, peroxide can travel through the enamel and reach the inner part of the tooth called dentine, which is connected to the nerve.
This temporary irritation of the nerve is what causes sensitivity. It does not usually mean damage has occurred, but it does mean the tooth is reacting to the whitening process.
Sensitivity from whitening is usually described as:
The sensation often comes and goes and is most noticeable during treatment or shortly afterwards.
Yes, mild to moderate sensitivity is very common and considered a normal side effect of whitening. Most people experience some level of sensitivity, especially in the first few days.
However, sensitivity should be temporary. It usually settles within a few hours to a few days after stopping or pausing whitening.
You may be more prone to sensitivity during whitening if you have:
People with these factors often still whiten successfully, but may need a slower or modified approach.
In most cases, sensitivity:
If sensitivity lasts longer than a few days, worsens, or becomes constant, whitening should be stopped and a dental check-up arranged.
Start using a toothpaste designed for sensitive teeth at least one to two weeks before whitening and continue during treatment. These toothpastes help calm the nerve over time.
If sensitivity develops, take a break for a day or two or reduce how often you whiten. Whitening more slowly often gives the same final result with less discomfort.
Cold drinks, ice, citrus fruits, fizzy drinks, and wine can make sensitivity worse during whitening. Avoiding these while whitening can significantly improve comfort.
Leaving whitening gel on for longer than recommended increases sensitivity without improving results. More is not better.
Dentist-supervised whitening systems often include desensitising ingredients and tailored guidance, making them more comfortable for people prone to sensitivity.
Stop whitening and seek dental advice if you experience:
These symptoms may indicate an underlying issue such as decay, a cracked tooth, or gum disease rather than normal whitening sensitivity.
When used correctly, whitening does not usually damage teeth, even if sensitivity occurs. Sensitivity is a temporary reaction, not permanent harm. Problems are more likely when whitening is overused, instructions are ignored, or teeth and gums are unhealthy before treatment begins.
Sensitive teeth during whitening are common and usually temporary. The discomfort is caused by temporary nerve irritation and typically settles once whitening is paused or completed. By whitening gradually, following instructions, and using sensitivity-friendly products, most people can achieve a brighter smile comfortably. If sensitivity is severe, persistent, or localised, a dental assessment is essential before continuing treatment.
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