Stock Photo - 1956 - Teeth care week in Tokyo for children and animals: A campaign to instruct children the best way to clean their teeth, was given added interest when groups of the youngsters were taken to Tokyo's zoo in Ueno park where a boy helped to brush the teeth of a hippopotamus, but the elephant was the star brushing his own teeth with a king size toothbrush. (Credit Image: © Keystone Pictures USA/ZUMAPRESS.com)

Stock Photo: 1956 - Teeth care week in Tokyo for children and animals: A campaign to instruct children the best way to clean their teeth.

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