Why are crest Whitestrips not working?

Author: Prof. Edmond Haley Sr.  |  Last update: Monday, August 4, 2025

Teeth Are Not Clean The chemicals break down the stain molecules that cause teeth to darken. Plaque buildup can block these whitening chemicals from reaching the stained teeth. Schedule a dental cleaning appointment first before using teeth whitening strips. This can prepare your teeth well for the whitening process.

Why are my Crest whitening strips not working?

If you don't brush your teeth before applying the whitening strips, the sticky plaque may block the stain-fighting chemicals from reaching your teeth. If you don't properly brush, sticky plaque hardens into tartar, trapping the stains on the surface of the teeth.

Why are my teeth still yellow after using whitening strips?

Whitening strips often contain peroxide-based chemicals to eliminate enamel stains, which may lead to temporary irritation and redness of the gums. This redness creates a visual contrast that can make the teeth seem more yellow.

How to make crest white strips work better?

The correct way to use Crest Whitestrips
  • Wipe your teeth dry with a dry index finger.
  • Carefully apply each strip and push firmly onto your teeth.
  • Keep them on for 10 minutes past the recommended 30 minutes -- it's like getting extra credit!
  • Peel them off carefully and wipe teeth clean again with a dry index finger.

Why are my teeth not responding to whitening?

If teeth whitening does not work for you, it might be because of the product you are using, the type of tooth stains or spots, or strength of the bleaching gel.

The #1 Top Remedy for Dental Plaque (TARTAR)

Why won't my teeth whiten with strips?

Teeth Are Not Clean

The chemicals break down the stain molecules that cause teeth to darken. Plaque buildup can block these whitening chemicals from reaching the stained teeth. Schedule a dental cleaning appointment first before using teeth whitening strips. This can prepare your teeth well for the whitening process.

Can teeth be resistant to whitening?

Genetics – Genetics can cause some teeth to have a darker color naturally and to be more resistant to whitening. Dental Restorations – Restorative dental work, like crowns, areas with dental bonding, and fillings, won't respond to teeth whitening treatments in the same way as natural enamel.

What not to do after using Crest White Strips?

A. Avoid Acidic and Staining Foods: Acidic and staining foods such as citrus fruits, tomatoes, and berries can compromise the results of teeth whitening and increase the risk of enamel erosion and staining. Limit consumption or rinse your mouth immediately after consuming such foods.

What happens if you leave whitening strips on longer than 30 minutes?

You might be tempted to leave whitening strips on your teeth for a little longer, but this will increase the risk and severity of side effects like sensitivity and gum irritation. In some cases, overuse of whitening strips has even led to chemical burns on the gums.

What is the best teeth whitening?

Crest's 3D Whitening Strips are probably the most recognizable teeth whitening method on this list, and with good reason. The brand stands out as the No. 1 recommendation in this category, with dentists telling me their patients get good results within a week or two of using the strips every day.

Can badly yellow teeth become white again?

Yellow teeth can regain whiteness through various methods, including good oral hygiene, professional dental cleanings, and teeth-whitening treatments. Stains from coffee, tea, or tobacco can be removed with adequate oral care, while professional procedures like bleaching or laser treatments offer quicker results.

Why are only the tips of my teeth whitening?

A lot of the time, the edges of your teeth respond more quickly to bleaching than the inner areas since the bleach can penetrate the enamel more rapidly. The center of your tooth has more enamel than the outside, so it takes longer to show results.

How to fix patchy teeth whitening strips?

To fix patchy teeth whitening, you can perform spot treatments with a pumice stone and hydrochloric acid. However, you'll want to check with your dentist before taking action. Patchy teeth whitening can be caused by several of these, with dehydration of your tooth enamel's surface being one of them.

Why didn't crest strips work?

Ensure that you follow recommended usage instructions on the packaging to get the optimal effect. If your teeth are significantly discolored, you may need to use 2 boxes of Crest 3D White Whitestrips initially to get the desired result.

Should I brush my teeth after whitening strips?

Brushing too soon could potentially damage this delicate layer and lead to tooth sensitivity or even enamel erosion over time. To strike a balance between these perspectives, dentists often recommend waiting at least 30 minutes before brushing your teeth after using whitening strips.

Does teeth whitening ever not work?

Teeth whitening treatments can be effective for most people, but not necessarily for everyone. It's important to consult with your dentist before undergoing any teeth whitening treatment. Dental professionals can evaluate your specific situation and recommend the most suitable options for achieving your best results.

Can I do two crest white strips in one day?

Extensive clinical and consumer testing was done to establish the safety and efficacy of Crest 3D White Whitestrips. However, based on the results of that work we do not recommend using more than 2 upper strips and 2 lower strips in a day.

Will my teeth go back to yellow after whitening?

With time, these tannins cling to your teeth's enamel and create yellowish stains. Similar to this, frequent use of tobacco products or cigarette smoking might cause your teeth to remain yellow even after whitening procedures. A yellow coating on your tongue could also be noticed.

How to maximize crest white strips?

6 Tips When Using Teeth Whitening Strips
  1. Consistency Matters. Teeth whitening strips should be applied to the teeth on a daily basis. ...
  2. Brush Your Teeth Prior to Application. ...
  3. Avoid Uneven Whitening. ...
  4. Use Teeth Whitening Strips in Moderation. ...
  5. Avoid Contact With the Gums. ...
  6. Do Not Consume Dark Food or Beverages After Whitening.

Is it better to use Crest White Strips in the morning or at night?

Using whitening strips before bed might be more convenient for some people, as it allows the product to work overnight without interference from food or beverages. On the other hand, using them in the morning can help you start your day with a refreshed, brighter smile.

Why don't whitening strips cover all teeth?

Most whitening strips are not big enough to cover every tooth. They may stop just before your molars. Sometimes, people don't apply them correctly, leaving some areas untouched by the whitening agents. When that happens, some teeth can end up looking whiter than others.

Am I supposed to rinse my mouth after teeth whitening strips?

Rinsing your mouth after using whitening strips can help remove excess whitening gel. However, avoiding immediate use of mouthwash containing certain ingredients that may affect the whitening process is advisable. Brushing remains the recommended practice for comprehensive cleaning.

What teeth cannot be whitened?

Teeth that have yellowed with age

Dentin is naturally yellowish and cannot be lightened with teeth whitening products.

What is the fastest way to whiten your teeth?

The fastest and best way to whiten teeth at home is by using professional whitening gel trays. These custom trays offer the best results at a lower cost than professional treatments, with minimal risk of sensitivity or gum damage. They provide long-lasting and sustainable whitening effects when used correctly.

What is the best over the counter teeth whitening?

  • Best Overall. Crest 3D White Daily Whitening Serum. Read more.
  • Best Value. Zimba Teeth Whitening Strips. Read more.
  • Best LED Light Teeth Whitening Product. Crest 3D Whitestrips 1 Hour Express + LED Dental Whitening Kit. Read more.

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