Dentist here. You're probably wondering if this is a disruptive threat to the established business of dentistry -- I have no idea. However, I can say that throughout the field I consistently run into dentists who will advocate for the health of the patient over the profit of the business. Consider the fluoridation of water throughout the world, one of the single greatest public health advances, when you take into account the benefits versus the cost of fluoridation.

But the science of it: I'm excited by the tooth growing possibilities, but it's important to understand that getting these teeth properly integrated into the body is quite a challenge. I'll give you an example: the periodontal ligament is like a very precise shock absorber attaching bone to tooth, and gives some flex to the tooth. (It's also the thing that makes orthodontics (moving teeth) work in the first place.) Sometimes, (usually in younger folks) if you knock a whole front tooth out, you can immediately replace it and the PDL will regenerate. Sometimes, however, the PDL fails to regenerate, and you end up with a situation where the tooth is ankylosed -- the ligamentous connection is gone, and the tooth is essentially fused to bone. This is one of the difficulties that will need to be overcome when regenerating teeth -- if that PDL fails to develop, you're stuck with a newly regrown tooth fused to bone. Thus, the tooth is more susceptible to breaking and _really_ difficult to extract from the mouth if it becomes infected.