That was quite the experence, at first I was wondering why this was in the yandere category because you did well in establishing how the MC was acting all nervously and suspiciously attached to Emily. However, I began to realize it wasn't Emily per say, but her teeth. I like how it was established early on during the flashback portion the MC's detachment towards other people as his fixation towards being a "dentist" was being formed.
Especially with how he acted, the nervousness but still going through with it in the end until he was finally caught and yet had no real "punishment" other than being told he couldn't practice dentistry. I mean, how could you really criminalized what MC did? He was pretty careful and made sure not to take too many teeth during his victims, and he's still pretty rich.
I have to say the ending felt a bit flat especially when the build up was pretty strong at the first part, but since it was limited due to it being a jam I honestly think it did well with its minimalistic style but strong story telling standpoint!