I'm a long time food storage person. Meaning I've been at it awhile. I don't pay a lot of attention to use by dates.
I've never had a problem w/dented cans. YMMV. Use at your own risk.
The one thing I do watch more carefully than others is with tomato products in cans. Tomatoes being acidic can cause problems and they will spurt on you when they've been let set too long. I'm not sure of the scientific explanation for that but I do buy the majority of my tomato/spaghetti type sauces in a jar for long term storage. For shorter time plans I'll buy the cans.
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