Laser for whitening teeth
Laser whitening uses a peroxide gel activated or heated by a dental light source; the gel, not the laser alone, changes tooth color.
The short answer
In a whitening appointment, the dentist isolates the gums, applies a peroxide gel to the tooth surfaces, and may use a light marketed as laser or LED. The peroxide breaks down stain compounds within enamel and dentin.
What is the direct answer?
What does this question mean?
A light may influence the gel or shorten the appointment, but it does not repair cavities, change the color of fillings, or remove every intrinsic stain. Gum protection and gel concentration are part of the clinical procedure.
What can you do next?
Have the dentist examine enamel, exposed roots, cracks, decay, and existing restorations first. Whitening is postponed when disease needs treatment, and sensitivity can be managed by changing the protocol or product.
When should you seek dental care?
Seek care for severe or persistent pain, chemical burns on the gums, or a tooth that remains dark after whitening. A single dark tooth may need evaluation for pulp injury rather than cosmetic treatment.
What should you ask the dentist?
Ask what light and peroxide gel will be used and what improvement is realistic. Ask whether crowns, bonding, or fillings will need shade replacement after natural teeth are whitened.