What is the direct answer?
Whitening changes colored molecules in enamel and dentin rather than filing away tooth structure, but misuse can cause sensitivity or gum irritation.
What does this question mean?
Peroxide molecules diffuse through enamel and dentin and oxidize discoloring compounds. Cavities, cracks, erosion, recession, and exposed dentin can increase sensitivity.
What can you do next?
Have teeth and gums checked first, then use the prescribed concentration and contact time and stop if sharp sensitivity or chemical irritation occurs.
When should you seek dental care?
Seek care before whitening with pain or decay, and afterward for persistent sensitivity, sore white gums, or an uneven result.
What should you ask the dentist?
Ask whether the stain is surface or internal and which method fits your enamel, gums, and restorations.
Frequently asked questions
Can another condition cause similar symptoms?
Yes. Examination distinguishes the relevant anatomy, materials, habits, and disease processes before treatment is selected.
What should I bring to the visit?
Bring your medication list and describe when the problem began, what triggers it, and what has changed.

