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Why Sensitivity Happens After Whitening and How to Avoid It

Posted on June 16, 2025

Sparkling white teeth are the goal for many people looking to improve their smile aesthetics, making teeth whitening in Vaughan incredibly popular. One of the challenges many people face, especially when sourcing in-store teeth whitening products or looking up DIY hacks, is tooth sensitivity. Pain and discomfort after whitening your smile can make the process less enjoyable and leave you unhappy with the appearance of your teeth. The most effective, reliable and safe way to whiten teeth is with your dentist in Vaughan. When you visit a clinic like Expo City Dental, you can count on our experienced dentists to tailor our effective whitening services to your smile.

Here is some insight into why you may be experiencing sensitivity during tooth whitening and how you can avoid it. 

What Causes Sensitivity After Tooth Whitening

teeth whiteningTooth sensitivity after whitening usually happens when the active ingredients in whitening products, such as hydrogen peroxide, penetrate the enamel and reach the softer dentin layer beneath. This layer of the tooth contains tiny openings that lead to the nerves inside your tooth. When these tubules are exposed or irritated, they can transmit sensations like pain or discomfort, especially when you consume hot, cold, or acidic foods and drinks.

The stronger the concentration of the whitening agent, the more likely it is to cause sensitivity. This can be especially sensitive if your teeth are already prone to sensitivity or if your enamel is thin. When you visit an experienced dentist in Vaughan at Expo City Dental, you can count on our experts to provide tailored treatments, making recommendations based on what makes sense for your smile, where many over-the-counter products wouldn’t be customizable. 

The Effects of Do-It-Yourself Whitening 

Some internet hacks suggest using acidic or abrasive substances like lemon juice, baking soda, charcoal or hydrogen peroxide for at-home whitening. While these may show some surface stain removal, they can also cause significant damage to the enamel over time. Once enamel is worn down, it doesn’t grow back, making sensitivity an ongoing problem and leaving teeth more vulnerable to cavities and decay. This is one of the many reasons it’s best to avoid DIY whitening and instead speak with your dentist in Vaughan about safe, effective options tailored to your needs. At Expo City Dental, we offer fast, effective Zoom Teeth Whitening in Vaughan that leaves your smile with visible shade differences in as little as one session. 

Tips to Mitigate Sensitivity After Tooth Whitening Treatments

The best way to ensure a comfortable and practical process is to talk to your dentist in Vaughan, who will provide you with resources and guidance that are meant to work for you and the unique needs of your smile. However, if you’ve experienced sensitivity in the past or are worried about it happening, here are some tips you can follow:

  1. Choose Professional Whitening Services
  2. Use Desensitizing Toothpaste Before and After
  3. Avoid Extreme Temperatures Post-Whitening
  4. Follow Aftercare Instructions from Your Dentist
  5. Don’t Overdo It

Brighten Your Smile with Teeth Whitening in Vaughan at Expo City Dental

At Expo City Dental, we provide tooth whitening in Vaughan that helps fade discolouration and staining so you can feel confident in your smile. To learn more about how our dentists near you can help you, book an appointment.

Get Started with Expo City Dental