Well, as our friend said, they need to gnaw, or their teeth will grow so long that they'
ll die of hunger.
The hamster doesn't eat the plastic, it is just gnawing (and destroying) .I don't think that molecules of plastic are harmful. Also molecules of cloths, carpets, curtains, wires, pieces of the wall, of carton boxes, books, furniture, etc can't be harmful but all this can gnaw a hamster.
If dangerous bacteria get in the body of the hamster will make it ill so we must not allow it strolling in dirty areas.
It's very normal trust me, my old hamster used to gnaw the bars of his cage despite having lots of toys and my current hamster who lives in a plastic Rotastak house also does the same to the roof. The reason is quite simple, they need to gnaw on things to keep their teeth in check. Just make sure your hammy has some nice things to chew on, although even then he may also like to chew his house as well, you can't stop him from doing this. If you bought your pet's house from a pet store I seriously doubt that there will be anything harmful in the plastic,
Your hamster isn't eating its cage she/he will be chewing it because hamsters need to ware there teeth down don't worry but if you want your hamster not to bite his/her cage or if you don't belive me then I sugget buying a chewing block (usally wood) and he/she will gnaw his/her teeth on the gnawing/chewing block :D
She is trying to get out but hurry get a glass cage instead plastic can Hurt their little digestive system
Probably not good for her so you should get a new cage. I had the same problem and I had to change my hamsters cage.
This is just something hamsters do they need something to gnaw on so their teeth don't grow long, this is just a way of them preventing that you should buy a gnawing toy because the plastic isn't good for him/her.
Beacause she is trying to escape. Also, I'm not really sure if it will make your hamster sick or not.