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How to make your teeth look whiter and brighter instantly, according to cosmetic dentists

No, there is no evidence to support that coconut oil can whiten teeth. Still, it can make them appear brighter after ...
Couriermail

Sea urchin teeth hold key to sharp knives

The urchins have self-honing teeth that can chomp through rock to carve out hideaways along the shore. Analysing their teeth, US scientists have found layered calcite crystals held together by ...