Seal what?

Today we were able to learn the PSR and how to classify them when probing, I really don't see the use of this for if you come across a pocket that is deeper then 6mm you have to record everything so if you find a deep pocket at the end you have to redo everything you just did! Oh crap!!! Anyways, I found that my molar is hard to put a sealent on since it has a flap of skin over it! Oh yeah!