Now, Japanese researchers are moving a promising, tooth-regrowing medicine into human trials. If the trial is successful, the researchers hope the drug will become available for all forms of toothlessness sometime around 2030. Japanese researchers are moving forward with an experimental drug that promises to regrow human teeth. Lasting 11 months, this study focuses on 30 males between the ages of 30 and 64—each missing at least one tooth. While these treatments are currently focused on patients with congenital tooth deficiency, Takahashi hopes the treatment will be available for anyone who’s lost a tooth.