I'm not sure if it is always necessary to remove an infected tooth as soon as the dentist says so. (See my other reply to samstonehill.) It probably boils down to one's own discernment, which means that it is necessary to learn about health and the human body as much as possible, and also away from the current scientific dogmas.
Re vaccines: I agree, that is of course another cause for many vague health problems - which doctors usually treat with another pill, instead of looking for causes...