Symptoms started around 4 mo. but no teeth came until a month or so later. When your baby starts drooling and biting everything in site, it is time for teething rings. (I also found this star shaped vibrating teether that vibrates when the baby bites down on it....my daughter LOVES it so if you see something like that, it is soooo worth it!)
My daughter started teething at 3 months although she is 7 months now and still no teeth! Lol it's a lot of drool!! I would go ahead and buy teething rings now. You can find them pretty cheap. My daughter chews on just about everything, teething rings help her keep off the wood furniture lol.