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the destruction of the enamel of a tooth owing to the action of bacteria that live in plaque.
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.
the splitting of water molecules into oxygen atoms and energy-rich hydrogen atoms to be used in...
the passage through which the nerve and blood vessels leave the root of the tooth.