There has been growing interest in natural oral care methods, and guava leaves are sometimes mentioned in traditional medicine for oral health.
What people sometimes claim about guava leaves and cavities:
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Guava leaves contain compounds with anti-inflammatory, antimicrobial, and analgesic properties.
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Chewing fresh guava leaves or using a guava leaf mouth rinse might help reduce oral bacteria (like Streptococcus mutans, which contributes to cavities), soothe gum inflammation, and possibly lessen pain.
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Some studies suggest guava leaf extract can inhibit plaque formation.
Important reality check:
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While guava leaves may offer temporary relief and contribute to better oral hygiene, they cannot reverse cavities once tooth enamel is significantly damaged. Cavities require professional dental treatment (fillings, etc.).
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If someone is trying this “trick,” it’s likely more about prevention, pain relief, or slowing bacterial growth — not a substitute for seeing a dentist.
Bottom line:
It’s one of those natural remedies that could support oral health alongside regular brushing, flossing, fluoride toothpaste, and dental visits. But if someone has a cavity, they still need professional care to prevent it from worsening.
Always consult a dentist for proper diagnosis and treatment of dental issues.