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Cranberry juice could be your teeth's new best friend. Researchers at the University of Illinois Chicago found that pure, unsweetened cranberry juice slowed dental plaque regrowth and reduced acid production — two key drivers of tooth decay. The secret ingredient? Natural compounds called proanthocyanidins, which interfere with harmful oral bacteria in both children and adults.
Cranberry juice could be your teeth's new best friend. Researchers at the University of Illinois Chicago College of Dentistry found that pure, unsweetened cranberry juice slowed the regrowth of dental plaque and reduced acid production by oral bacteria — two key processes behind tooth decay. The likely heroes are proanthocyanidins, naturally occurring compounds in cranberries already known to prevent bacteria like E. coli from sticking to cells.
The small study involved 22 participants (14 children and 8 adults) who rinsed with one of three beverages: pure cranberry juice, a cranberry cocktail (27% juice with added sugar), or plain water. Plaque samples were collected before and 30 minutes after consumption, revealing that only the pure cranberry juice group showed reduced plaque regrowth and lower acid levels.
Key Takeaways:
Why it matters: Most fruit juices are considered bad for teeth, so finding one that may actually help is a notable shift. While the study is small and short-term, it opens the door to cranberry-based oral health products — and a simple dietary tweak that could support dental hygiene.
