I would have to say that Crocs probably have the largest teeth out of all of Varanus(that we currently know about). Being an arboreal animal, long teeth, as also the case in arboreal snakes, will help the animal secure its meal up in the treetops. This would prevent a meal from accidentally slipping away, and plumetting to the forest floor, where it may then become a wasted meal.
That is why handling crocs, despite how "tame" or "calm" they are, generally is not a good idea.. One quick turn of the head, and you'll be in the hospital undergoing reconstructive surgery..I've seen plenty of horrifying pictures of bite victims from crocs...far more damaging than any other bite wound i've seen... Perhaps komodos, because of their massive size and shape of the skull, and the sheer power behind it, could inflict a more serious bite, but then again, who's actually keeping these as pets, where that becomes something to worry about?? Take caution with crocs, never take your eye off of them, unless you would like to have horrible, noticeable scars....
Look to my post a few threads down, I have included a pic of some teeth and part of the lower jaw bone(probably half of the jawbone) of an 8' male croc that I have in my collection... Compared to some of the other skulls that I have from african,asian,indonesian, and australian monitors, nothing compares to a croc...
Cheers,
bob