This representation of cavities and bacteria shows workers chipping away at King Dedede's teeth. Dedede's reaction shows how painful a cavity can be: it affects his sleep. Dedede and Tuff are both scared of going to the dentist and try to avoid it.
Kramer has drastically different opinions on cleanliness than his friends. He believed it was critical to be in the shower for an hour to reach optimal levels of cleanliness. Jerry and Elaine get by with ten minute showers and give him a few tips to improve his showering efficiency and technique.
Father Flynn coaches the boys basketball team and takes a moment to talk about the importance of cleanliness. He walks around the court showing the boys his nails so they understand that he holds himself to the same standard that he expects of them.