Teething... a mystery

Ever since Zoe was 3 months old, I've thought, hey, maybe she's teething... mostly because everytime anyone sees Zoe drooling, or chewing on something, they say she must be teething.. at almost 10 months, she has no teeth. I think the drooling thing until she was about 6 months old, was just about her learning to swallow it (I read that somewhere, but in only one of the books I saw, it should have been in all of them).. She occasionally has these unexplainable boughts of crying and fussing, which are either belly pain or teething pain, but still no teeth. It is a great mystery ;)