Smell, taste and appearance are reasonable indicators of food that is safe to eat but they cannot be relied on absolutely. The quantity of pathogenic bacteria (the toxic ones) in food can reach dangerous levels before there are any obvious signs that it is 'off'.
That's why they have use by dates really. You can ignore the best before since it is only an indicator of when the quality of the product will begin to drop, but the use by is there purely to safeguard our health.
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