Mine always started tething at about 2 months even though the teeth didn't come through for another few months. It can take ages. The signs are as always red cheeks, very acidic stools, nappy rash and just general grumpy. I just use a bit of teething gel, a cool teething ring, something to bite on e.t.c. I also found the Nelson's teetha granules help. Aside that, there is not a lot you can do.
Apparently the Dentinox gel is a godsend as you can use it every 20mins if required. I think Max is starting as he's started to drool a lot. Can tell about his stools as he's always had a runny bottom!!!