The himalayan chews don't harbor bacteria, as long as it's kept dry.
Himalayan Dog Chew
The way the dogs eat these chews is by licking it, get it somewhat soft & then grind it off w/their teeth. There's minimal risk of teeth breakage, but it can happen. They work through the small pcs pretty fast but it still lasts a lot longer than bullies. I took it away when the pcs got too small, about 2-3". So I always got the med or large pcs for them & it lasted 4ever.
They do say that you can nuke the smaller pcs in the microwave to make cheese puffs, but I never tried it...heard that it stinks up the whole house!