The woman known to Australian TV viewers as "Mrs Marsh" through her commercials for Colgate toothpaste, has died at her home in Noosa on Queensland's Sunshine Coast.
The popular TV campaign which began in the late 1970s featured Barbara Callcott as Mrs Marsh, who snapped a stick of chalk which had been dipped into a glass of dyed water, to show how the toothpaste penetrated enamel to protect teeth.
Colgate says Ms Callcott continued working with children through education programs promoting oral health, until this month.
Colgate staff were saddened by the news and extend their condolences to Barbara's family," Chris Pedersen, Managing Director, Colgate, said in a statement.
"In honour of her legacy, Colgate will be initiating an education grant in her name in recognition of her contribution to oral health education," Mr Pedersen said.