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IME, even things like shampoos go bad though, or at least their packaging can. I once "lost" a bottle of shampoo in the back of the linen closet, and when I found it, the bottle had become so brittle that when I dropped it in the shower, the bottle broke and most of the shampoo went down the drain. It would take my family 10 years to use 100 bottles of shampoo, maybe longer. By then they'd be no good.
Same thing with toothpaste. I stocked up on AquaFresh when I worked at SmithKline, but by the time I got to the last couple of tubes, they definitely tasted stale. And I hadn't had them stored for that long, maybe 3-4 years. Probably beyond the freshness date, but we really don't use a huge volume of toothpaste either, maybe 5 tubes a year for the 4 of us. And yes, we all brush at least twice daily, we just use a little dab on the brush.
If it works for her, great, but I can't see that working for my family.
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