The science behind teeth whitening

Posted by Pear Dental

Happier, healthier smiles.

Teeth whitening is one of the most popular cosmetic dental treatments out there, and for good reason. Who doesn’t want a bright, dazzling smile that makes you feel confident and ready for anything?

But have you ever wondered what’s actually happening when you whiten your teeth? It’s not just magic – there’s some pretty cool science going on behind the scenes.

Let’s break it down and take a closer look at how teeth whitening works.

Why do teeth get stained in the first place?

Before we dive into the science of whitening, it helps to understand why teeth get stained in the first place. Your teeth have a protective outer layer called enamel, which starts out as a bright, pearly white. But over time, enamel can pick up stains from the foods and drinks you consume – think coffee, tea, red wine, and even some fruits and veggies. Tobacco use, certain medications, and simply aging can also cause teeth to lose their lustre.

Underneath the enamel is a softer layer called dentin, which is naturally yellowish. As your enamel wears down, more of the dentin shows through, making your teeth look less white.

So, when we talk about teeth whitening, we’re really talking about tackling those surface stains and brightening up the enamel to restore that brilliant smile.

The active ingredient: Hydrogen Peroxide or Carbamide Peroxide

The key players in most teeth whitening products are hydrogen peroxide or carbamide peroxide. These compounds are bleaching agents that break down into oxygen molecules when they come into contact with your teeth.

Here’s how it works:

Hydrogen Peroxide is a powerful bleaching agent that breaks down quickly into oxygen and water. When applied to your teeth, the oxygen molecules penetrate the enamel and break apart the bonds of the stained molecules. This process essentially “bleaches” the stains, making them less visible and leaving your teeth looking whiter.

Carbamide Peroxide is another common bleaching agent, which is actually a combination of hydrogen peroxide and urea. It works in a similar way but breaks down more slowly, making it a good option for at-home whitening kits where the product is left on the teeth for a longer period.

Both of these ingredients work on the same principle: they oxidise the stains on your teeth, lifting them away and leaving your enamel looking brighter.

The Whitening Process: Step by Step

So, what does the teeth whitening process actually look like? Whether you’re using an in-studio treatment or an at-home kit, the basic steps are similar:

  1. Preparation: Your dentist will usually start by cleaning your teeth to remove any surface plaque and debris. If you’re whitening at home, it’s a good idea to brush and floss before you begin.
  2. Application: The whitening gel, which contains hydrogen or carbamide peroxide, is applied to the teeth. In a professional setting, the dentist might use a custom-fitted tray to ensure even coverage, while at-home kits typically include pre-filled trays, strips, or pens.
  3. Activation: In some cases, a special light or laser is used to “activate” the whitening gel, speeding up the chemical reaction and enhancing the results. This step is more common in professional treatments.
  4. Wait Time: The gel is left on your teeth for a set amount of time – usually between 15 minutes to an hour, depending on the strength of the product and the level of whitening desired. During this time, the peroxide breaks down the stain molecules on your teeth.
  5. Rinse and Reveal: After the treatment time is up, the gel is rinsed away, and you’re left with a noticeably brighter smile! In-studio treatments often deliver dramatic results in just one session, while at-home kits might require multiple applications to achieve the desired shade.

 

How long do the results last?

One of the most common questions we get is, “How long will my teeth stay white?”

The answer depends on a few factors, including your diet, oral hygiene habits, and whether you smoke or vape. Typically, professional teeth whitening can last anywhere from six months to a couple of years, while at-home treatments might need more frequent touch-ups.

To keep your smile looking its best, it’s a good idea to avoid foods and drinks that are known to stain teeth and to brush and floss regularly. You can also consider using a whitening toothpaste or mouthwash to maintain your results.

Dr. Anthony Walsh

Dentist

“When done correctly, teeth whitening is a safe and effective way to brighten your smile. However, it’s important to follow the instructions carefully and avoid overusing whitening products, as this can lead to tooth sensitivity or irritation.”

If you have any concerns, it’s always a good idea to consult with your dentist before starting a whitening treatment.

Teeth whitening might seem like a simple cosmetic procedure, but there’s some fascinating science at play behind that brighter smile. Whether you opt for a professional treatment or an at-home kit, understanding how teeth whitening works can help you make the best choice for your smile.

Ready to give your smile a boost? At Pear Dental, we offer professional teeth whitening services that can help you achieve the radiant smile you’ve always wanted. Book a consultation today, and let’s get started on your journey to a brighter, more confident you!

Let’s talk teeth whitening.

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