6 toothbrushes, primitive and modern.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: 6 toothbrushes, primitive and modern. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: 6 toothbrushes, primitive and modern. Wellcome Collection. Source: Wellcome Collection.