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Why Are My Teeth Yellow When I Brush Them Every Day?

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Close-up of a mouth with visible yellowing on teeth and a finger touching the lip

It can be confusing when you brush twice a day and floss, only to look in the mirror and see yellow teeth. You’re trying to take care of your smile, but discolouration often has little to do with how clean your teeth actually are.

At Upper Gage Dental Centre, we understand your concerns. The truth is that factors beyond your brushing routine can also affect the colour of your teeth, from the foods you eat to your own genetics. Understanding these causes can help you find the right path toward a brighter smile.

What Your Tooth Colour Really Means

It might surprise you to learn that teeth aren’t naturally pure white. Just like your hair and skin, tooth colour comes in a range of light shades. The natural colour of your teeth is a combination of two distinct layers.

  • Enamel: This is the hard, outer layer of your teeth. It’s translucent, which means that it’s slightly see-through.
  • Dentin: This is the layer beneath your enamel, and it has a naturally yellowish tone.

If your enamel is thin—which can happen with age or simply be part of your genetics—more of the yellow dentin shows through, making your teeth appear less white. A dental professional can assess your enamel health during a routine dental exam and cleaning.

Everyday Causes of Yellow Teeth

Even with great brushing habits, parts of your daily routine can contribute to tooth discolouration over time. Many factors can lead to stains that regular brushing might not remove on its own.

Foods & Drinks That Stain

Many popular foods and drinks contain strong pigments that can cling to your tooth enamel. You can learn more about foods to avoid for healthier teeth, but common examples of pigmented substances include:

  • Coffee & tea
  • Red wine
  • Dark sodas
  • Berries & grape juice
  • Tomato sauce & soy sauce

Lifestyle Habits & Other Factors

Your habits and personal history can also play a role in the shade of your teeth. Some other reasons for yellowing include:

  • Tobacco Use: The tar and nicotine in tobacco products can cause stubborn yellow and brown stains.
  • Age: Over time, enamel naturally thins, revealing more of the yellow dentin underneath.
  • Genetics: The natural thickness and shade of your enamel can be inherited from your family.
  • Tooth Grinding: This habit can wear down enamel, making teeth appear more yellow. A custom nightguard can help protect your teeth from grinding.

Review Your Brushing Technique

Brushing every day is important, but how you brush matters just as much. A few small adjustments to your technique can make a big difference in the fight against surface stains and yellow buildup.

The Two-Minute Rule

Make sure you brush for a full two minutes, twice a day. This gives your toothpaste enough time to work its magic and allows you to clean every tooth thoroughly without rushing.

Cover Every Surface

It is easy to miss spots, especially the inside surfaces of your teeth and the back molars. Try to be mindful of reaching all the nooks and crannies for a complete clean. Plaque is a sticky, yellowish film. If left behind, it can harden into tartar—something only a professional cleaning from your dentist can remove.

Three toothbrushes, including two electric and one manual, standing in a cup beside a bathroom sink

Tips to Prevent Stains & Keep Your Smile Bright

You can take simple, proactive steps to help manage tooth discolouration and keep your teeth looking their best between dental visits. A little prevention and a consistent daily oral care routine go a long way.

Simple Changes at Home

  1. Rinse With Water: After you have coffee, tea, or other stain-causing foods, swish some water around in your mouth. This helps rinse away the pigments before they can settle on your teeth.
  2. Use a Straw: When you drink dark sodas, iced tea, or iced coffee, a straw can help the liquid bypass your front teeth.
  3. Keep Up Your Routine: Consistent brushing and flossing your teeth are your first line of defence against the plaque that can make teeth look yellow.

Can Yellow Teeth Become White Again?

Yes, in many cases, you can brighten a smile that has yellowed over time. The correct approach depends on the cause of the discolouration and your own personal smile goals. A conversation with a dental professional can help you explore your options, from at-home care to professional teeth whitening methods.

Professional Help for a Brighter Smile

For stains that go deeper than the surface, professional treatments can offer noticeable results. In-office teeth whitening procedures use safe and effective methods to lighten the shade of your teeth, giving you a fresh look.

The Power of a Professional Clean

Never underestimate the effect of a professional cleaning. Your dental team can remove surface stains and hardened tartar that you can’t get at home. Regular visits to your dentist in Hamilton are a key part of maintaining both the health and the appearance of your smile.

At Upper Gage Dental Centre, our team is ready to guide you with compassion toward your oral health goals. If you have questions about your smile, reach out to schedule a conversation today!

Written by Dr. Matthew Rydant

Dr. Matthew Rydant graduated from the University of Detroit Mercy School of Dentistry in 2006. That same year, he entered into private practice at Upper Gage Dental Centre.

Dr. Rydant is a general dentist who enjoys all aspects of dentistry, particularly cosmetic, family, and pediatric dentistry. If he had to choose a favourite treatment, he’d pick endodontics, more commonly known as root canals. He thrives on providing quality care in a trusting environment.

Dr. Rydant and Dr. Judith Kivinen are married with 3 children: Hazel, Noam, and Jemma. When he’s not working, you may find him on the local golf course or indulging in some delectable food.

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