She is about four months old and recently (over the last week or so) has exhibited incredibly bad breath, smells like she's been eating her own fecal waste. No kidding, her mouth smells like the litter box. I feed her Purina Kitten formula and she drinks plenty of water from pretty much anywhere she can... her water dish (recirculating fountain with charcoal filter) the sink, the shower floor after someone's gotten out, even your glass if she can fit her head in it. I haven't seen any changes in her appetite or her behavior patterns, We are at the tail end of battling a flea problem, and she did have tapeworms because of it, but she's already been treated for that. Any guidance as to what may be the cause would be greatly appreciated.