TEETH WHITENING

How Does Whitening Work?

The whitening agent (either carbamide peroxide or hydrogen peroxide) penetrates the enamel to reach the discolored molecules inside your tooth. Oxygen molecules from the whitening agent react with the discolored molecules in your teeth, breaking the bonds that hold them together. The oxygen molecules spread, whitening the entire tooth.The result is a brighter, whiter smile!

Teeth whitening can last for one or more years, depending on how well you take care of your teeth. For best results, we advise our patients to do both the office whitening and the home whitening for maintenance. Contrary to popular belief, whitening doesn’t have any permanent side effects on your teeth.

Flash ! Advanced Power – German Technology

Teeth whitening. at Khoury Dental Clinic in Beirut Lebanon

At our clinic, we use the “Flash” Advanced whitening machine – Made in Germany . It’s the most advanced and effective teeth whitening product in the market. It is a bleaching process which lightens discoloration of enamel and dentin. With the Flash machine, you will be granted immediate results, six to ten shades lighter in less than an hour. Compared to tray methods, Flash is the perfect choice for the busy individual.

Home Whitening

For the home whitening technique, we will first need to take an impression of your teeth to create customized trays that will fit the exact contours of your teeth and gums.
A bleaching gel will then be given to you to use with the trays in very small amounts.
The home whitening will remove most stains in a period of 12 to 20 days.

FAQ – Office & Home Teeth Whitening? We’ve got you covered.


When done correctly, both office and home whitening are safe and do not cause permanent damage to enamel. The whitening gels work by breaking down stains, not by thinning the tooth surface.


Temporary sensitivity can occur when the whitening agent passes through the enamel and slightly irritates the nerve inside the tooth. It usually lasts 24–48 hours and can be managed with desensitizing toothpaste or shorter whitening sessions.


Not necessarily — it’s just slower. Office whitening uses stronger gels that achieve results in one session, while home whitening uses gentler gels over a longer period, making it easier for patients with sensitivity.

Yes — in fact, many dentists recommend a combination approach. The office treatment gives you an immediate boost, while home whitening trays help you maintain and fine-tune the shade over time.


For most people, professional whitening is best done once or twice a year under dental supervision. Doing it more often can increase tooth sensitivity or gum irritation. If you want to keep your teeth bright between sessions, we can give you safe home whitening trays for gentle touch-ups instead of repeating full-strength treatments too frequently.

Every patient will have different results. The final shade depends on your natural tooth color, the type of staining, and the whitening method used. Most people see their teeth become several shades lighter, but how bright they get varies from person to person. Our goal is always to create a brighter, natural-looking smile — unless you specifically request an extra-light shade.

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