Frequently Asked Questions

We have compiled a list of frequently asked questions which covers most issues our users have, if you have any further questions or we haven’t covered anything please be sure to get in touch, we are always able to help even with the smallest of questions.


Are Crest 3D White Whitestrips harmful to teeth or can they damage the enamel?

No, this product is formulated to be safe and effective when used as directed. All our safety data indicate that Crest 3D White Whitestrips are safe on tooth enamel. They contain the same whitening ingredient as the expensive professional products dentists use to whiten teeth.

Will Crest Whitestrips affect my dental work?

CREST 3D WHITE WHITESTRIPS WILL ONLY WHITEN NATURAL TEETH. The strips will not whiten caps, crowns, veneers, fillings or dentures. Do not use with dental braces. If you are in need of dental work, have dental work or have staining from medication, ask your dentist to determine if whitening is appropriate. Crest 3D White Whitestrips Advanced Vivid and Professional Effects are designed to hold well to teeth, do not use on loose teeth or temporary or loose restorations.

When will I start to notice results with Crest 3D White Whitestrips?

Noticeable results vary by person, but most people start seeing results halfway through the regimen, with full results upon completion.

Can pregnant women use Crest whitestrips?

While there is no evidence that teeth whitening while breastfeeding or being pregnant is harmful, we recommend you check with your doctor before using Crest 3D White Whitestrips.

How long does teeth whitening last?

The length of time your teeth will stay whiter is influenced by several factors, including how often you drink coffee, tea, dark colas, red wine or smoke. Crest’s most advanced whitening strips, Supreme FlexFit & Professional Effects, keep your teeth whiter for 12 months.

How long after whitening teeth should I wait to eat?

Eating after whitestrips will not affect results. There are no eating or drinking restrictions after using Crest 3D White Whitestrips.

Can I wear the strips longer than the instructed wear time to get better whitening results?

We recommend following usage instructions for each product. Longer wear time can result in tooth sensitivity and/or gum discomfort.

Sometimes I see white spots on my teeth immediately after I remove a strip. Will they go away?

Yes, the white spots are temporary. These spots are not harmful and will go away in a few hours.

How do I use 3D White Whitestrips?

It is best if you do not brush your teeth immediately before applying strips. Open the pouch and remove the strip. Peel the strips from the backing liner and align with gum line. Press gently for good contact. Fold the rest of strip behind teeth to keep in place. Wear strips for required amount of time, then remove and discard.

Is it okay to use 3D White Whitestrips back to back?

Yes. With Crest 3D White Whitestrips, you can use one strip right after the other (back-to-back). Wear strips for the time instructed, then remove; rinse or wipe if needed, then apply a second strip.

What happens if I skip an application?

You can skip or miss a couple of applications without affecting your whitening benefit.

Can I re-use a strip?

No, Using a strip over again will not provide any tooth whitening benefits. Even though there may be gel remaining on the strip when you take it off, most of the hydrogen peroxide has been depleted.

What do I do if the strips keep coming off?

Look into a mirror to properly apply the strips, making sure the strip is in good contact with the teeth. If the strips begin to slip, close your mouth and create suction to tighten the strips up again. Don’t touch the strips excessively with your tongue. You can try gently tucking the strip in the spaces between your teeth with your fingernail, then folding it behind your teeth. You can also try Crest 3D White Whitestrips Advanced Vivid or Professional Effects which have Advanced Seal technology—specially designed to strongly adhere to your teeth.

How do I remove gel left on my teeth after using strips?

Since the left over gel is not harmful, you can do any of the following:

  1. Rinse your mouth with water
  2. Wipe the gel off your teeth
  3. Brush it off
  4. Leave it, as it will dissolve eventually
Will my teeth be more susceptible to stains after using Whitestrips?

No. Whitestrips will not cause your teeth to stain faster. Scratching teeth while brushing actually makes your teeth more porous and susceptible to staining at the same time as cleaning them.

Can I wear Whitestrips overnight while I sleep?

No, do not wear Crest Whitestrips overnight or while sleeping.

Can I brush my teeth immediately before using Whitestrips?

Do NOT brush immediately BEFORE applying strips. To avoid gum irritation, allow for some time to pass after you have brushed your teeth to apply strips

Can I brush my teeth immediately after using Whitestrips?

Yes, after using Whitestrips, you can brush gently.

Can I use Whitestrips after a professional cleaning from a dentist or hygienist?

You may want to wait a few days after a cleaning if your mouth is sensitive before using Crest 3D White Whitestrips, otherwise, you may have more discomfort. We recommend you discuss this with your dentist.

Can I use whitening toothpaste while using Whitestrips?

Yes. We recommend using Crest 3D White Teeth Whitening Toothpaste while you’re whitening your teeth to help maintain your white smile.

Can I use mouthwash after using Whitestrips?

It’s OK to rinse with an over the counter mouthwash after using Crest 3D White Whitestrips. We recommend using Crest 3D White Multi-Care Whitening Rinse to help maintain your whiter teeth.

My Crest 3D White Whitestrips is expired. Can I still use it?

Although Crest 3D White Whitestrips that have passed expiration date are still safe, we don’t recommend using them past their expiration date, as the whitening ingredient’s efficacy will be weakened.

What are the ingredients in Crest 3D White Whitestrips?
Water Prevents carbomer from dehydrating the teeth.
Glycerin Humectant, acts to thicken gel, helps make gel sticky so it will adhere to teeth.
Hydrogen Peroxide Whitening Ingredient
Carbomer Gel agent, gives adhesion properties to gel
Polyvinylpyrrolidone (PVP) Adhesive polymer
PEG Humectant, acts to thicken gel, helps make gel sticky so it will adhere to teeth.
Acrylates Copolymer Thickening polymer. Helps keep the strip in one piece during use.
Sodium Hydroxide* Adjusts pH to neutral
Sodium Saccharin* Better taste
Pyrophosphate* Protects against tartar in Crest 3D White Whitestrips Stain Shield only
* These ingredients are the source of sodium content – See Nutrition Facts twistie for total sodium content.
INGREDIENTS – Strip & Backing
Textured Whitening Strip Polyethylene
Backing Polypropylene