Tooth discoloration remains a widespread aesthetic concern linked to daily habits such as drinking coffee, tea, and sugary beverages, as well as smoking. These stains can reduce self-confidence and often lead individuals to seek whitening treatments. While clinical bleaching procedures using hydrogen peroxide or carbamide peroxide deliver fast results, they are relatively expensive and may cause tooth sensitivity or enamel irritation.
Against this backdrop, researchers from Prof. Dr. Moestopo University explored fruit-based alternatives. Strawberries (Fragaria x ananasea) and blueberries (Vaccinium corybosum) contain natural acids and antioxidants that may influence tooth color. The study directly compared their effectiveness under controlled laboratory conditions.
Simple Laboratory Design
The research team examined 24 healthy premolar teeth. Each sample was artificially stained and then immersed in either strawberry juice or blueberry juice for different durations: 1 hour, 3 hours, and 5 hours.
To measure changes in tooth color, the researchers used a digital spectrophotometer (VITA Easyshade V), which evaluates:
- Lightness (L): how bright the tooth appears
- Chroma (C): the intensity of color
- Hue (H): the tone or shade of color
This approach allowed the team to objectively track even small changes in tooth color before and after treatment.
Key Findings: Strawberry Shows Stronger Whitening Effect
Both strawberry and blueberry juices produced measurable changes in tooth color. However, strawberry juice consistently delivered stronger whitening effects.
Main findings include:
- All samples showed increased lightness (L values), meaning teeth appeared brighter
- The most noticeable improvement occurred after 5 hours of immersion in strawberry juice
- Statistical tests confirmed significant differences in color before and after treatment (p < 0.05)
- Strawberry juice produced greater overall whitening compared to blueberry juice
In practical terms, tooth color shifted from darker shades (B3) toward lighter shades (A3.5 for strawberry and A3 for blueberry), indicating visible improvement.
Why Strawberry Works Better
The stronger effect of strawberry juice is linked to its chemical composition. According to Mirna Febriani and colleagues, strawberries contain:
- Malic acid
- Ellagic acid
- Vitamin C
- Phenolic compounds
These substances help break down stains on the tooth surface through mild oxidation. Strawberry juice also has a lower pH than blueberry juice, making it more acidic and more effective at loosening surface stains.
Blueberries, on the other hand, contain anthocyanins—deep blue-purple pigments known to stain surfaces. While blueberry juice still caused measurable changes in the experiment, its staining compounds may counteract its whitening potential.
Not a Complete Replacement for Clinical Whitening
Despite promising results, the researchers emphasize that natural whitening methods have limitations. Strawberry juice primarily removes surface stains and does not alter deeper tooth structure, unlike professional bleaching agents.
There are also risks associated with frequent use. The acidic nature of strawberry juice can lead to:
- Mild enamel erosion
- Increased tooth sensitivity
“Natural ingredients such as strawberry juice can assist in removing extrinsic stains and improving brightness, but their effects are limited compared to chemical bleaching agents,” the authors from Prof. Dr. Moestopo University explain.
Implications for Public Health and Daily Care
The findings offer practical value for individuals seeking affordable and accessible dental care options. In regions where professional whitening treatments are costly or less accessible, fruit-based alternatives may provide a temporary solution.
However, dental experts caution against overuse. Natural remedies should complement—not replace—professional dental care. For long-term oral health, proper brushing, regular dental visits, and controlled use of whitening agents remain essential.
For the dental industry and policymakers, the study highlights growing public interest in natural, low-risk oral care solutions. It also opens opportunities for developing safer, plant-based dental products.
Author Profiles
Mirna Febriani, drg., M.Kes. is a lecturer in the Department of Dental Materials and Dental Technology at Prof. Dr. Moestopo University, Jakarta. Her research focuses on dental materials and restorative dentistry.
Tuti Alawiyah, drg., Sp.Ort. is an orthodontics specialist and academic at Prof. Dr. Moestopo University, with expertise in dental alignment and aesthetic treatments.
Herlia Nur Istindiah, drg., Sp.Ort. is also an orthodontics specialist at the same institution, specializing in dental health and cosmetic dentistry.
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