5. He’s taking a big cut (although you could probably assume this)
4. The stretching your jaw must do to allow the brush access to your teeth is ache-inducing when you’re not lying back in a chair having someone else do it.
3. Without that previously-unappreciated spit-sucker, your saliva drools out your mouth the entire time you brush your teeth.
2. You’re not going to travel with it.
1. You will never, not once, use the “polishing”, “flossing”, or “tongue-scraping” head attachments