Maybe I'm jaded from previous high dollar awards, but $150k doesn't seem like a bad amount to me.
Depending on what was damaged and how, the dental bills could easily run into the $30-40k range (especially since he probably sees an overcharging, over-rated dentist). Getting 2x damages in pain and suffering is reasonable, especially to anyone who's ever had a cracked tooth.
And it doesn't take much, especially if the damage wasn't caught right away. I had a dentist work on an occlusion. Didn't catch that he messed up, and a few years later I started a multi-year program to repair the damage that so far has totaled over $20k (with my dentist giving me about 25% discount). Granted, it got that bad because I wasn't seeing a dentist regularly
