Fact Check: Can orange peel whiten teeth?

A claim on Pinterest stating that orange peel can whiten teeth is MOSTLY FALSE. 

Claim:

A Pinterest post claims that orange peel can whiten teeth. The user prettydesigns.com states that oranges have the same bleaching properties as lemons and as per the user it easier to use for teeth whitening since they taste better and have a peel. The post suggests rubbing the inside of an orange peel on the teeth to remove surface stains and eliminate yellowing quickly and easily. The post can be accessed here.

Benefits of orange peel

Orange peel, often discarded as waste, holds great potential as a low-cost nutraceutical resource due to its rich content of bioactive compounds. Instead of being treated as waste, it can be recycled into value-added food supplements, offering beneficial dietary fiber and polyphenols. These components act as non-caloric bulking agents, enhance water and oil retention, improve emulsification, and may help protect against diseases caused by oxidative stress. Additionally, extracts from orange peel show promise in the food industry as sources of bioactive compounds, making it an advantageous and sustainable nutritional supplement. The peel’s flavonoids, including hesperidin and polymethoxylated flavones, are particularly noted for their potential to lower cholesterol and blood pressure, contributing to cardiovascular health.

Can Orange Peel Whiten Teeth?

D-limonene a compound found in orange peels, has solvent-like properties that can assist in removing stains and oils, making it useful in some cleaning and skin-brightening products due to its bleaching properties.

In a randomized control trial conducted by Ping Xie et. al. it was found that combination of d-limonene and Perlite was effective for removing stains, while d-limonene alone provided limited benefits, primarily in preventing new smoking stains. All tested products were safe to use, with no reported adverse effects. The findings of the trial suggest that d-limonene on its own is not a powerful solution, particularly for older stains or tea-related discoloration.

An article published by Leslie A Ehlen et. al. found "Acidic drinks weaken tooth enamel, causing irreversible damage. Regular exposure to low pH levels erodes the enamel, increasing the risk of long-term dental problems."

Orange peel contains D-limonene which has bleaching properties. Weak scientific evidence suggests that the compound may help in preventing new smoking stains but no scientific evidence supports the claim that orange peel can whiten teeth. It was also discovered that acidic beverages can weaken tooth enamel, leading to weakened teeth, and since orange peel is acidic, it may damage the enamel.

Responding to the claim Dr. Satendra Singh, Senior Dentist, Sanjeevan Hospital, New Delhi said "While orange peel is sometimes promoted as a natural teeth-whitening remedy, it's important to understand the potential risks involved. If used frequently, citric acid, which is acidic in orange peel can contribute to enamel erosion, weakening the teeth over time. Even though compounds like d-limonene found in the peel may offer mild stain removal, It may leads to hypersensitivity in teeth. The effects are minimal compared to professional or over-the-counter whitening treatments that have been scientifically validated. For those seeking to brighten their smile, I recommend consulting with a dentist to explore safe, effective options. Overusing acidic substances like orange peel can lead to long-term damage that outweighs any short-term benefits."

Dr. Nandita Mohan, Sanjeevan Hospital, New Delhi added, "Using orange peels to whiten teeth is a popular home remedy, but there is limited scientific evidence to support its effectiveness. Orange peels contain compounds like d-limonene, which may help remove surface stains. However, relying on such acidic substances can pose risks. The citric acid in orange peels can gradually erode the enamel, which is the outer protective layer of the teeth. Once the enamel is worn away, teeth become more sensitive, and the risk of cavities and decay increases. While some may experience temporary surface stain removal, the long-term effects of using orange peels for teeth whitening can be detrimental to oral health. I would advise against using citrus peels for this purpose. Instead, patients should seek safer alternatives that have been clinically tested, such as over-the-counter whitening toothpaste, gels, or professional whitening treatments offered by dentists. These options are specifically formulated to be both safe and effective in removing stains and brightening teeth without causing damage to the enamel. Always consult with a dental professional before trying home remedies that might harm your oral health in the long run."

Medical Dialogues Final Take

While D-limonene, found in orange peels, has mild bleaching properties and may help prevent new smoking stains, its effectiveness in whitening teeth, especially older stains, is limited. No strong scientific evidence or medical consensus supports the claim that orange peel can whiten teeth. Therefore, it should not be relied upon as a primary teeth-whitening method.  However, it is essential to recognize that acidic substances can wear down tooth enamel. Over time, the erosion weakens the enamel, leading to dental issues.

Thus, the claim is Mostly False.