Pros: Clever little combination, and makes sense too what with pirates having many dental problems in reality. Also liked the tune as well. Absolutely loved the little bit with the crab in the beginning. Subtitles were helpful here and there. Use of cannon was great.
Cons: Animation, while good, could use a little polish. Not the motion (the motion part was pretty great actually) I mean but the artwork itself. That will come with experience though so no worries there. Patient's voice was a little hard to understand at times, could have been clearer.
Other: All in all, I enjoyed it. I can tell if you keep this up, you'll be able to produce material of better quality in time, but all things considered, I thought it was pretty good. Thumbs up.