Do shampoos and conditioners have an expiration date?
How close to do have to follow expiration dates?
Is food still good after the expiration date?
What do the meat expiration dates on pork mean?
What happens to birth control that is past the expiration date?
What is the shelf life of spaghetti sauce and expiration dates?
What will happen if I served breakfast sausage that was 20 days past its expiration date?
No, DEET does not expire, so you should be able to use it no matter how old the product is that contains it unless otherwise indicated by the manufacturer.
DEET is a very stable compound and deteriorates at a negligible rate; it breaks down so slowly that it doesn't require an expiration date. Basically it's good roughly forever.
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