How do I refill my Stainless Steel Refillable Floss Container?
Here are the steps:
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Unscrew cap
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Pull ~3” of floss from the spool
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Drop spool into container
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Feed floss through hole in the cap
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Screw the cap back on & floss

What should I do if the cap's metal cutter gets bent or flattened out?
Stainless steel is very strong. If your container gets banged up (e.g. from getting stuffed in a travel bag) there's a possibility the top flap could get bent down (it is small after all).
If it’s no longer elevated enough for a clean cut, you can easily fix it. Either unscrew the top and gently push it back out using tweezers or a small metal tool, or carefully pry it upward from the top, just a tiny bit.