The study was conducted on extracted human teeth in a laboratory. The regenerated layer measured roughly 10 micrometers, compared with natural enamel, which reaches around 2,000 micrometers on a biting surface. Researchers demineralized extracted human teeth, applied a single coating of the gel, let it dry, then immersed the teeth in controlled mineralization baths formulated to replicate the ionic environment of saliva. The study used extracted human teeth in laboratory conditions. What should I do about tooth sensitivity now?