A dentist called Peabody became the first person to add soap to toothpowder in 1824 and chalk was added in the 1850s by John Harris.

1824年皮博迪医生首次在牙粉中添加皂粉；19世纪50年代约翰·哈里斯在牙粉中添加了白垩。

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There is then another huge gap in the history of toothpaste until the 18th Century, when toothpowder, or dentifrice, became available in Britain.

直到十八世纪，英国出现了牙粉，这是牙膏史上的另一个巨大的飞跃。

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