The Eel that Doesn't Brush His Teeth

My son and I have gone to the Houston Zoo for years. His favorite animal is and has always been this eel. We affectionately call him "The Eel that Doesn't Brush His Teeth." This is because the first time we met him, we noticed his teeth were very dirty. He constantly opens and closes his mouth. He must have incredibly sore jaw muscles. I remember that first day talking to Nathan about his teeth and that he should brush them and Nathan replied, "He can't brush his teeth because he doesn't have arms." Still true today. Lovely day at the zoo!