Frequently Ask Question : Safety

17. Are Whitestrips safe on tooth enamel?

1. Yes. Crest 3D White Whitestrips contains hydrogen peroxide, the same enamel-safe ingredient dentists use for tooth whitening. Extensive testing has shown the product to be safe when used as directed.

17. Can I use more than 2 sets of Whitestrips a day?

1. 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.

17. What are the ingredients in Crest 3D White Whitestrips?

1. 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

17. What happens if I swallowed a strip?

1. It will simply pass through your system without causing any damage.

17. What happens if I swallow some of the gel from the strip?

1. No adverse effects will result from ingesting the peroxide gel. However, swallowing large amounts of peroxide can cause nausea and stomach irritation.

17. Is using a toothpaste that contains peroxide while using Whitestrips harmful?

1. The combined amount of peroxide from the toothpaste and Crest 3D White Whitestrips (professional or retail) isn't harmful.

17. Does the hydrogen peroxide in Whitestrips cause cancer?

1. There is no evidence that hydrogen peroxide causes cancer in humans.
   
   The FDA and Health Canada and scientific experts at the World Health Organization have reviewed the data on hydrogen peroxide and neither has ever concluded that hydrogen peroxide is carcinogenic.
   
   Hydrogen peroxide is a safe and trusted ingredient that has been used for years in first aid products, mouthwashes and facial cleansers.

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