Feeling whitening
Teeth whitening can cause brief sensitivity or gum irritation because peroxide temporarily affects tooth nerves and soft tissues.
The short answer
Teeth whitening can cause brief sensitivity or gum irritation because peroxide temporarily affects tooth nerves and soft tissues. The feeling is more likely when dentine is exposed, a tray fits poorly, or the product is used too often.
What is the direct answer?
What does this question mean?
Whitening gels usually contain carbamide peroxide or hydrogen peroxide, which breaks down stain molecules inside enamel and dentine. Sensitivity occurs when these molecules reach dentinal tubules and stimulate the pulp nerves; irritated gums usually indicate gel contact with the gingiva.
What can you do next?
Stop or space out applications if sensitivity begins, keep gel off the gums, and use a soft toothbrush with a fluoride toothpaste. A dentist can check for decay, cracks, recession, or exposed roots before selecting a lower-strength product or a fitted tray.
When should you seek dental care?
Arrange a dental examination when pain is strong, lasts after the whitening course, affects one tooth, or comes with swelling, a cavity, or a cracked tooth. Urgent care is needed for facial swelling, difficulty swallowing, or difficulty breathing.
What should you ask the dentist?
Ask whether the colour change is surface stain or an internal tooth shade, whether you have exposed dentine or untreated decay, and which peroxide concentration and application time fit your mouth. Also ask how to protect restorations, since fillings, crowns, and veneers do not whiten like natural enamel.
Frequently asked questions
Why do my teeth feel sensitive after whitening?
Peroxide can temporarily stimulate fluid movement in dentinal tubules, especially where enamel is thin or roots are exposed.
Should I continue whitening through pain?
Pause the product and have persistent or marked pain assessed before continuing.