Now, does it matter if I am pregnant or  breastfeeding? Which ones are okay to use, the strips, the toothpastes, and/or the blue light therapy? So many options to choose from, right? Before we talk about each of those ingredients, it’s important to point out that every pregnancy starts out with a small chance (3-5%) of having a baby with a birth defect, we call this the background risk. Now that we have defined the background risk, when we talk about any possible increased risk for birth defects, we refer to the increased risk above that background risk. Now, let’s break it down and take a look at some of these products and their ingredients.

1. Whitening strips

Most teeth whitening products contain various ingredients that are not well studied in pregnancy or lactation. Without good research it’s difficult to know whether the ingredients can cause a problem for the developing baby or breastfed infant. However, when the product is used as directed on the teeth (not swallowed) it is unlikely that a significant amount would enter the pregnant person’s system or the breast milk. Let’s take a closer look at some of those common ingredients:

• Carbamide peroxide breaks down into urea and hydrogen peroxide when in contact with organic compounds in living tissues.
  • Urea is a chemical formed from protein breakdown and is often used in lotions to improve hydration. Urea is also found naturally in the body and is also part of breast milk. Since the body can excrete large amounts of urea, exposure to small or moderate amounts of urea is not expected to increase the chance of birth defects or cause any adverse effects to the breastfed infant.
  • Hydrogen peroxide is added to cosmetics and personal care products as an antimicrobial ingredient to inhibit the growth of microorganisms. It also oxidizes stains on the teeth to whiten them. When in contact with your teeth, hydrogen peroxide will break down as a molecule of water and oxygen gas. Because of this, it is not likely to pose any significant chance for birth defects or problems while breastfeeding.

You may also find,

• Sodium Hydroxide. This ingredient is commonly found in industry and home-based products, such as soaps. It is toxic to tissues, and it is not meant to ingest or breathe. When used in dental preparations, they alter the acidity of the mouth for better protection of the teeth. There are no human studies done on sodium hydroxide in pregnancy or breastfeeding. However, due to potential maternal alkalosis (increase in the pH of the body), careful use should be advised in when an individual has kidney problems during pregnancy or while breastfeeding.
• Glycerin is colorless, odorless, and a sweet glycerol (sugar alcohol), used as a lubrication agent in multiple cosmetic products such as toothpaste, shaving cream, and soaps. Glycerin crosses the placenta in small amounts but there are no studies in humans looking at glycerin. However, since data in animals did not show any increase in birth defects, it is not likely that glycerin in tooth whitening would put a pregnancy or breastfed infant at increased chance for problems.
• Menthol is widely used in a variety of products in the cosmetic world as a flavoring and fragrance agent. There are no studies in humans on use of menthol in pregnancy or breastfeeding. However, animal data did not show any increase in birth defects. Therefore, when used in small amounts, it is unlikely to pose any increased chances for birth defects or any other problems during pregnancy or while breastfeeding your baby.
• Carbomer is commonly used as thickening agents and emulsifiers for pharmaceuticals and many other products. Carbomer is added to teeth whitening strips as a thickener and usually found in small amounts in some products. Because of the large molecular size of carbomer and the small amount used in these products, it would be unlikely to cause problems during pregnancy or enter the breast milk in amounts that are of concern for a breastfeeding baby.

2. Whitening toothpastes

Majority of these toothpastes contain:

• Sodium Monofluorophosphate (MFP), a sodium salt commonly used to increase the amount of fluoride incorporated into the enamel which can help prevent cavities. No research has been done during pregnancy; it is unknown if it causes problems for the baby. Sodium Monofluorophosphate can potentially cause adverse effects if ingested, its use should be monitored closely during pregnancy and while breastfeeding your baby.
• Sodium fluoride is a colorless or white powder that dissolves in liquid. Sodium fluoride is mostly used for prevention of dental cavities, to polish the teeth, and reduce oral odor. Sodium fluoride can be found in drinking water. Ingestion of these ingredients in excessive amounts during pregnancy could lead to impaired development of the baby’s teeth. Sodium fluoride gets into the breastmilk in small amounts, and it is not expected to cause adverse effects to the breast-fed infant.

3. Blue (LED) Light Therapy

This therapy is often used to treat acne and sun damage. This therapy will only work in areas where the light reaches, and it usually needs a combination of photosynthesizing drugs to activate the ingredients and help whiten the teeth. This blue (LED) light therapy is used with gels or strips containing some of the ingredients above. Some may contain ingredients we have not reviewed above. There is limited research on the use of blue light therapy during pregnancy or breastfeeding and the risk of birth defects or other pregnancy problems are unknown. However, the light itself is not expected to increase the risk of birth defects or pose any adverse effects to the breastfed infant.

4. Other ingredients commonly used:

• Herbals are not regulated by the Food and Drug Administration (FDA). Therefore, we are never sure what is in the product, and there is not enough information to evaluate possible risk to a developing baby or breastfed infant. For more information about herbals and supplements during pregnancy or breastfeeding, please refer to our fact sheet at: https://mothertobaby.org/fact-sheets/herbal-products-pregnancy/.
• Alcohol should be avoided completely during pregnancy. It has been established that there is no known amount or type of alcohol that is okay to consume during pregnancy. However, using a teeth whitener with alcohol is not expected to result in a significant amount getting in your bloodstream or the breast milk since the product is applied topically. Do not swallow or drink any of these products and use as directed on the package. If desired, you can select an alcohol-free product. To read more about alcohol during pregnancy and while breastfeeding, please refer to our Fact Sheet at: https://mothertobaby.org/fact-sheets/alcohol-pregnancy/ .

If you are interested in learning more about other products and their individual ingredients, make sure to contact the experts at MotherToBaby.

And remember, it is important to feel good in your own skin but, if you are leaning towards getting your teeth whitened, here are some tips to think about before buying any product. 

1. Look for non-alcohol based products.
2. Use the product as directed, do not swallow it, and do not exceed the time listed on the package.
3. Contact the experts at MotherToBaby.org with your questions.

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