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Quick Answer. Diet Coke lasts for six to nine months past its printed date in the pantry if unopened. The soft drink lasts for the same amount of time if refrigerated and unopened.
Sammie M-Bryant, AR. Sammie, The mouthwash that does have an expiration date it means the manufacturer has taken the time to run tests on the efficacy of their ingredients. Not having an expiration date doesnât mean it doesnât expire. It just means they didnât run any tests on it.