I'd be really curious to learn how his teeth and gums are doing. If you can find a way to eat without ever having food touch your teeth or gums, I'd imagine you'd have incredible oral health. Thoughts?
If you have to chew gum to make up for this, you're starting to lose the simplicity which was one of the idea's main selling points. A bit like switching from cycling to work to driving to work to save 10 minutes, then having to spend an hour in the gym to make up for the lack of exercise.
I can't help thinking there will turn out to be many more subtle effects to compensate for. Yes, I am a sceptic.
Problems with the digestion system, teeth and gums will occur that way. So, even if it was healthy, it would lack fibers and structure that cleanup our digestion system and make our jaw, teeth and gums stronger.
Chewing your food thoroughly also exercises your teeth and stimulates the vitality of the socket and gums which hold the teeth in the jaw. We know that activity that causes muscles to stimulate the bone protects against bone loss and one loss and decalcification is one of the many ways which teeth become lose in their sockets and contribute to plaque and bacteria getting under the gum line, which is a primary reason for tooth loss.