Much Gnashing of Teeth

Logan has been gnashing his teeth all day today. We just got back from a rare afternoon visit of the YMCA and all throughout the car ride home he was smacking his bottom teeth with his top teeth. The sound is one of those sounds--much worse than nails on a chalkboard. It's like he's a little rodent or something and has to wear down his teeth or else they'll grow into his face. I can't stand the sound! It took a lot of will power to not crash the car when he was doing it. I can't see how it doesn't hurt him. And the funky thing about it is that I think Logan likes to do it, and I think he knows that it annoys me. Ahhhh!