Two things...
First off they ARE removable, doubt he would want to go to a wedding, or formal event wearing that.
And second, let's not forget where Perkins is from. Texas which is pretty much still part of the "Dirty south", and grills are a part of their culture. Really, Im not joking. So dont say hes stupid for doing it, say you dont like that look personally.
what I think, is that Grillz are played out. I think its a fad, and I thought was gone already. But....
Check it out. Paul Wall, who is from TEXAS, and is a rapper/Dentist makes these for celebs. Perkins should have went to him and got a hometown discount. lol
http://www.youtube.com/watch?v=McK6G25ivFc