The nice thing about provent-a-mite is that it lasts so long. When mites hatch from their eggs into nymphs, they search out snakes to bite and drink from, when they've reached adult size, they drop off the snake and search out any tight nook or cranny they can squeeze into to lay their eggs (like the corners of your cages). Mite eggs are very tough I don't know of anything other then exteme high heat that will kill them in the egg. Provent-a-mite will stick to the surfaces of your cage for a long time, even after washing, and will kill the mite nymphs as they hatch and begin to wander around looking for snakes. People who only treat the snake and not the environment will often find themselves being re-infested with mites over and over and over again. This is why it's important to treat both the snake AND the enclosure.