Some concerns about my Orange Tabby

Hi my name is Kayleigh, and Iv'e got an Orange Tabby who is about 5-6 now. I've had her since she was a new born, and I do take her to a vet when I -Can- But with no income at the moment, and unable to get a job thanks to our oh so wonderful economy here in OR. I'm unable to do much of anything for her at the moment other then feed her, until my future husband leaves for basic training come may 16th. I've got a few problems, that I need some input on. Shorty (My Orange Tabby) seems to be developing black spots on her lower lip, and right up the middle crease on her nose. She's also got a bad tooth in her mouth, which doesn't seem to be causing her much pain, then again she doesn't talk so, I don't know. But she's still eating and drinking, which is good, her breath is just really rank smelling, which I would guess would be from bacteria or a possible tooth infection. About these black spots, is this something I should be worried about? Is it cancerous or dangerous to her in any way? Or is it like how a red haired person would get freckles? She has a single black spot on the upper roof of her mouth, that caught a vets eye in the past, we were going to a convention and took her there to get tranqs for the road trip. She seemed concerned, and told us if it got bigger to bring her back, but it hasn't appeared to of changed much at all since then. She's just getting more black spots on her lower lip and nose. Does anyone know what is causing this?