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    History of teeth-cleaning reaches as far back as 5000 BC, when Egyptians made tooth powder with ox hooves, myrrh, powdered and burnt eggshells, and pumice
    Romans and Greeks also used tooth powder but added crushed bones and oyster shells
    Toothpowder became available in England in 18th Century and included abrasive substances such as brick dust, crushed china, earthenware and cuttlefish
    Bicarbonate of soda used for basis of most toothpowders and the poor applied this directly with fingers
    William Addis credited with making first toothbrush in 1780 made from cattle bones and wild boar hair
    First synthetic toothbrush developed in 1930s America



http://www.bbc.co.uk/dna/place-london/A2818686