I have a lot of dental work & use Oral-B Super Floss to floss my bridges. They're designed to for cleaning braces, bridges and wide gaps between teeth.
BUT I figured out another use for them. I use them clean my breech plug hole.

They're a long strand with a stiffened end, about the size of 30 lb. monofilament fishing line for threading between teeth. The strand has regular floss and a spongy floss.
I'm using the .25 cal acp breech plug conversion & the stiff end threads right in to the small breech plug hole.

When you finished with the breech plug, you can always us 'em on your teeth.