After researching dkp sites for Trakanon, here are the # of teeth drops per raid.
35/9 = 3.8
So my proposal would be to increase his maximum teeth drops to 5, with 4 being the average. If evidence is found that he can in fact drop 6 teeth, post it up and I'll rework some math. Additionally, if many more raid drops are available, we can likely get a better average.