What should the poet have known in the poem "Oh I Wish I'd Looked after me teeth"???????

Can u explain me what does the questiom actually mean
poet have known that he should not eat sticky food like chocolates and brush everyday as much i know when i have read dis i said which i remembered


The poet is saying that she should have known that eating those sweets etc was paving a way towards various tooth ailments like cavities etc. She would have spent her shilly on other useful things rather than spending them for buying those gobstoppers and sherbets.
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