Please dont think I am arguing here because I am not, I am only talking about my own experiences.
I have a close friend who is a dentist and when my eldest son was 11 weeks old he looked in everyway like he was teething. I told her about it and she said there was every possibility that his teeth were moving downwards causing him some discomfort and that it could be that he wont get his teeth actually showing themselves for months. She told me its common because all teeth have to go through the same process. Aydan didnt actually get a tooth cut through the gum untill he was 13 months old.
When I saw the health visitor the other day I asked again (because as I said Alfie 'seems' to be teething) she said the same thing.
I guess everyone goes by what they are told and by their own situations.