Unfortunately, no. These only deposit a couple micrometers of enamel per day if used twice daily. They could potentially help as a form of preventative maintenance, but reversing significant dental cavities seems unlikely.
Given that most people don't lose all of the enamel of any of their teeth it seems like there wouldn't be any point of going to a dentist. By the time you're getting the age where you'd even think about dentures, this treatment would completely reverse all tooth decay no?
Where I think this would really shine is with receding gums. It'll be able to slowly add protecting to a part of the teeth that has absolutely no protection. That will help "clog" the pores and reduce sensitivity as well as likeliness of a cavity.