Tooth duller is a sardonic military slang term for hardtack — the notoriously hard, dense biscuits issued to soldiers and sailors as a field ration. The nickname captures the lived experience of biting into hardtack unprepared: it could chip or blunt teeth if not soaked in liquid first. Typically used in historical military contexts and is now more of a piece of colourful period slang than active usage.
The soldiers nicknamed their rations 'tooth dullers' after one man cracked a molar on a dry biscuit.
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(derogatory, military slang) Hardtack.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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