You can use dental floss to thread needles. Put a loop of it through the needle and use it as a threader to pull the thread through the sewing needle. Those cheaply made metal ones always break.
I think she means the dental floss threaders can also be used to thread sewing needles. You can buy floss threaders where you buy dental floss, it is used to get dental floss under dental bridges. I've tried it but most of my sewing needles have a small eye and the dental threaders don't fit.
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My dentist gave us these floss threaders that help in threading dental floss under bridges, etc.
I have struggled with using regular threaders and thin wire that I have bent in the middle to use as a threader, but I think I have found an ideal threader.