Teeth whitening works by using chemical agents, typically peroxide-based bleaching agents, to remove stains and discoloration from the teeth. These agents penetrate the enamel, the outer layer of the teeth, and reach the underlying dentin to lighten its color.

The process of teeth whitening involves the following steps:

• Preparation: Before the whitening procedure, the dentist may clean the teeth to remove any plaque, tartar, or debris that could interfere with the whitening process.
• Application of Whitening Agent: The dentist applies a whitening gel or solution containing hydrogen peroxide or carbamide peroxide to the teeth. The gel is usually applied directly to the teeth or placed in custom-fitted trays that are worn over the teeth.
• Activation: In some cases, a special light, laser, or heat may be used to activate the whitening agent and enhance its effectiveness. This step helps accelerate the breakdown of stains and discoloration.
• Waiting Period: The whitening agent is left on the teeth for a specific duration, which may vary depending on the type and concentration of the whitening product used. During this time, the peroxide breaks down and releases oxygen molecules that penetrate the enamel and target the discolored molecules.
• Rinse and Evaluation: After the waiting period, the whitening agent is rinsed off, and the dentist evaluates the results. Multiple whitening sessions may be required to achieve the desired level of whiteness.

The peroxide-based bleaching agents work by oxidizing the organic molecules responsible for tooth stains, breaking them down into smaller, less pigmented molecules. This process effectively lightens the color of the teeth and reduces the appearance of stains.

The longevity of teeth whitening results can vary depending on several factors, including the individual's oral hygiene habits, dietary choices, and lifestyle factors. On average, teeth whitening effects can last from several months to up to three years. However, it's important to note that teeth whitening is not a permanent solution, as teeth can become stained or discolored over time due to various factors.

The cost of teeth whitening can vary depending on several factors, including the location, the dental clinic or professional performing the procedure, the type of whitening treatment chosen, and any additional services or products included.

It's important to consult with a dental professional to determine the most suitable teeth whitening option for your specific needs and to get an accurate cost estimate. They can assess the condition of your teeth, discuss your desired outcome, and provide you with a personalized treatment plan and cost breakdown.