Researchers are edging closer to a future in which dentists might help patients grow new teeth instead of relying on dentures, bridges, or titanium implants. Building on decades of developmental biology, teams in Japan, the United Kingdom, and the United States are now testing drugs and lab-grown “tooth buds” that could eventually regenerate fully formed, living teeth in the human mouth.
The most advanced efforts focus on switching back on the body’s own tooth-making machinery, which normally shuts down after the second set of teeth emerges in childhood. Early clinical trials and laboratory breakthroughs suggest that human tooth regrowth may soon be achievable, although experts stress that regulatory hurdles and technical challenges still stand between today’s experiments and routine chairside treatments.
The hidden third set of teeth
For years, developmental biologists have known that humans carry dormant potential for a “third dentition,” a reserve set of teeth that never normally erupts. Researchers studying tooth formation have identified molecular pathways that act as brakes on this process, including a protein called USAG-1 that limits how many teeth form in mammals. By treating this protein as an off switch, scientists realized they might be able to restart tooth development in adults who have already lost their permanent teeth.
In animal models, blocking USAG-1 allowed signaling molecules such as BMP to interact more freely, which in turn triggered the growth of new tooth structures in species like ferrets that naturally show extra dentitions. Building on that biology, teams in Japan designed antibodies that specifically inhibit USAG-1, effectively lifting the brake on tooth formation. According to overviews of regenerative dentistry, this approach aims to harness the same developmental programs that shape baby and adult teeth, but to do so later in life and in a controlled, therapeutic way.
Drug trials in Japan push regrowth toward the clinic
The most concrete step toward human tooth regrowth is now underway in Japan, where investigators have begun testing a medicine designed to stimulate new teeth in people missing at least one. Reports on the program describe how Japanese Scientists Begin Human Trials for Tooth Regrowth Drug using a candidate known as TRG-035. The innovation lies in how TRG-035 targets the USAG-1 pathway, with the goal of encouraging a new tooth to form in the jaw even after adult teeth have fully developed.
Clinical summaries explain that Targeting USAG with a therapeutic antibody allows key growth factors to resume their role in tooth formation, potentially awakening the body’s latent third set of teeth. The same research trajectory is highlighted in analyses that ask whether patients could grow a third set of teeth by 2030, noting that early animal tests were successful and that Kyoto University Hospital in Japan is now evaluating safety and efficacy in adults. While much work remains before any such drug could be widely prescribed, the existence of a named candidate like TRG-035, with human volunteers already enrolled, marks a decisive shift from theory to translational medicine.
Lab-grown teeth and “tooth primordia” in the pipeline
Alongside drug-based regrowth, scientists are also trying to grow replacement teeth outside the body, then transplant them into the jaw. Developmental biologists have already created early-stage “tooth primordia” in the lab, combining stem cells and signaling molecules to form tiny structures that resemble the buds of natural teeth. In landmark experiments described in coverage of lab-grown human teeth, these primordia were transplanted into mice, where they developed into fully formed teeth complete with roots, enamel, and pulp.
More recently, researchers in the United Kingdom have reported growing tooth-like structures in controlled laboratory settings, with lab-grown teeth described as a potential alternative to fillings. In that work, the white areas seen on scans represent developing tooth tissue, sometimes called “tooth organoids,” that could eventually be implanted into gaps in the jaw. A related report on Lab work at King’s College London notes that these structures could “fill in the gaps” in regenerative dentistry, potentially offering a more natural solution than conventional implants. Researchers such as Xuechen have outlined different strategies for placing these tissues, including transplanting young tooth cells into the jaw or allowing them to mature in situ after the initial growth process starts in the laboratory.
Beyond dentures and implants: why regrowth matters
The stakes for successful tooth regeneration are high, both medically and socially. Tooth loss affects millions of people worldwide, and By Essential Endodontics notes that adults lose an average of 7 teeth by age 50. Missing teeth can impair chewing, speech, and nutrition, while also carrying a heavy psychological burden in cultures that prize a “perfect smile.” Current solutions like dentures and implants restore function for many patients, but they come with trade-offs, from bone loss under dentures to the surgical risks and long-term maintenance of titanium posts.
Regrowing living teeth could address many of those shortcomings by restoring a structure that integrates naturally with the jawbone and responds to forces in the mouth. Analyses of future innovations in Tooth regeneration highlight how stem cell therapies, bioengineered tooth buds, and drugs like TRG-035 might one day reduce the need for prosthetic devices. Articles that ask What would be required to replace dentures and implants with regrown teeth emphasize that a successful therapy would not only restore appearance but also preserve jawbone volume and bite strength. For people with genetic conditions such as anodontia, who never develop a full set of teeth, a regenerative drug or transplantable tooth bud could be life changing, offering a first chance at a complete, natural dentition.
From enamel gels to realistic timelines
Even as whole-tooth regrowth captures headlines, more incremental advances are already reshaping dental care. One area of rapid progress is enamel repair, where scientists are developing gels and coatings that encourage minerals to re-form on the tooth surface. A detailed explainer on How Much Can Tooth Enamel Really Regrow Today notes that Your body does not naturally regrow fully lost enamel, but early enamel damage can sometimes be repaired with the right materials. Building on that principle, a team in Nottingham has reported a new gel that restores dental enamel and could revolutionise tooth repair by growing an enamel-like layer on top of dentine. While these technologies do not regrow entire teeth, they show how biomimetic materials can push dentistry closer to true regeneration.
Experts caution, however, that full tooth regrowth will not arrive overnight. A commentary on tooth regeneration and science communication notes that even once a breakthrough therapy is demonstrated, it will be followed by years of regulatory reviews. Articles with headlines such as Humans Could Grow Entirely New Teeth and Humans May Be Able to Grow New Teeth Within Just Years often point to the early 2030s as a plausible horizon for first-in-class treatments, assuming current trials succeed. The American Dental Association has also weighed in, asking Can teeth be regrown and noting that Researchers at Kyoto University Hospital in Japan have already regrown teeth in the mouths of mice and ferrets. That track record in animals, combined with the first human trials of a USAG-1 blocking drug, supports cautious optimism that human tooth regrowth may move from speculative idea to clinical option within a single generation, even if the earliest therapies are limited to specific patient groups or single missing teeth.