The two largest misconceptions by the lay public about dentistry are 1) people have "soft" teeth and 2) wisdom teeth cause lower anterior crowding. Wisdom teeth will not cause lower anterior crowding, ask any competent orthodontist, or just think about it from a logical standpoint. Realistically can a tooth the size of a wisdom tooth(generally not that large) be expected to "push" all of the root structure of the 5 to 7 teeth mesial to it to "move" the lower anteriors?? It just doesn't happen. However, occlussal irregularities, forces of the tongue pushing out, the facial muscles "pulling" in and vertical erruption forces can cause crowding. This interm with the inherrant tendencies for a mesial drift of teeth as we age can, and often will cause lower anterior crowding as we age(due to the larger root structure of maxiallry anterior teeth it is often not seen, or much less pronounced in the maxilla)
Now, is having wisdom teeth removed a "scam" that the dental community runs?? I will admit that some dentists and oral surgeons may be a bit quick to reccomend wisdom tooth removal. The criteria that I use is as follows: Is the wisdom tooth fully errupted(i.e. fully through the gum)? Does the patient demonstrate the ability to keep the wisdom tooth clean? Is the periodontal(gum) situation the same around the wisdom tooth as all the adjacent teeth? If any of these questions is a "no" I reccommend extraction. The most common problem with wisdom teeth is something called pericoronitis, which is a PAINFULL
infection that from time to time can occur around a wisdom tooth that isn't fully errupted through the gum. If the tooth is impacted, hey the worst thing that can happen is if the impacted tooth is pushing on the tooth infront of it. This can cause extensive decay to the infront of the wisdom tooth in an area that is unrestorable and then not only will the wisdom tooth need to come out at a later date, but also the tooth infront of it
Now, nobody likes the concept of having their wisdom teeth removed, but it is very likely that if your dentist has reccommended it that it is for good reason. Think of it this way, if your dermatologist reccomends an "interesting" looking freckle be removed because of a future risk, you'd do it in a moment. This is the same type of situation!