Scientists Are Regrowing Human Teeth: 7 Things You Should Know About This Dental Breakthrough

Here’s the short answer: yes, scientists are genuinely working on ways to regrow human teeth, and the research is further along than most people realize. A drug trial in Japan made global headlines earlier this year, and labs worldwide are racing to turn tooth regeneration from science fiction into a real clinical option. But the treatment is not available at your dentist’s office today, and there are some important nuances buried under the hype worth understanding before you start canceling your crown appointment.

Below are seven things the science actually says, explained plainly.

1. The Tooth-Regrowth Drug Trial Is Real — and It Showed Early Promise

Researchers at Kyoto University and the Medical Research Institute Kitano Hospital in Japan completed a first-in-human clinical trial testing a drug designed to stimulate tooth growth. The drug targets a protein called USAG-1 (uterine sensitization-associated gene 1), which normally suppresses tooth development. By blocking USAG-1, the team hoped to “unlock” the latent ability mammals have to grow extra teeth.

Their published animal work showed mice and ferrets growing new teeth after treatment. The human trial, which wrapped its safety phase, was designed only to check whether the drug was safe in people — not to confirm it regrows teeth in humans yet. So the headline is real, but the results are still early-stage.

You can read more about the underlying research at the NIH’s PubMed database, where the foundational USAG-1 studies are published.

2. Humans Already Have a Hidden Third Set of Teeth — Sort Of

You probably learned in school that humans get two sets of teeth: baby teeth, then permanent adult teeth. That’s accurate in practical terms. But developmentally, humans carry a “rudimentary third tooth bud” that is normally suppressed very early in fetal development.

The USAG-1 drug targets the signaling pathway that shuts those buds down. Think of it like a dormant switch. The researchers are not engineering teeth from scratch — they’re asking your body to do something it was almost programmed to do anyway, but then turned off. That’s a fundamentally different (and more biologically promising) approach than trying to grow teeth in a lab dish and implant them.

3. “Regrowing Teeth” Covers Several Very Different Technologies

Not all tooth-regrowth research is the same, and lumping it together creates confusion. Here are the main tracks scientists are currently pursuing:

• USAG-1 inhibitor drugs — the Japanese trial described above. Stimulates dormant tooth buds. Most advanced in clinical testing.
• Stem cell scaffolding — growing tooth-like structures from a patient’s own stem cells on a biodegradable scaffold, then implanting them. Still largely in animal models.
• Gene-edited tooth bud transplants — modifying cells from wisdom teeth or other extracted teeth to seed a new tooth. Early preclinical stage.
• Enamel repair peptides — not full tooth regrowth, but synthetic peptides that can partially remineralize damaged enamel. Already closer to market in some forms.

The timelines are very different across these tracks. Enamel-repair products may reach consumers within a few years. A full drug that reliably regrows a functional adult tooth in a human jaw could still be a decade or more away from your dentist’s chair.

4. Even If It Works, It Won’t Replace All Current Dental Care

Here’s something the breathless headlines tend to skip: even in the optimistic scenario where the USAG-1 drug reaches patients, it would most likely help people who are missing teeth grow a replacement — not undo a cavity or reverse gum disease. The drug appears to trigger growth of a new tooth, not repair an existing damaged one.

That means preventive care, fillings, gum treatment, and most restorative dentistry would remain exactly as important as they are today. A regrown tooth would still be susceptible to cavities and gum disease. The fundamentals of oral health do not change.

5. The “Third Teeth” Framing Has Limits Worth Knowing

Several outlets ran with the phrase “a third set of teeth” as if it were a guaranteed, on-demand outcome. The reality is more careful. The drug produced an extra tooth in animal models, but researchers have not confirmed it consistently produces a complete, properly positioned, fully functional tooth in adult human jaws. Adult jaws are denser, the eruption environment is different, and the target sites for a new tooth matter enormously for bite and alignment.

Dental researchers are excited — genuinely — but they are also appropriately cautious about what the early human-safety data means. One honest benchmark: the drug’s developers themselves have said they hope to have it available in Japan by 2030, and that’s an optimistic internal target for a single country’s regulatory pathway.

6. What This Means for Dental Implants and Other Options Right Now

If you are missing a tooth today, you have real, excellent options that exist in 2026, not 2030+. Dental implants remain the gold standard for replacing a missing tooth because they mimic the natural root structure, preserve jawbone, and function like a real tooth. They are not a placeholder while you wait for regenerative medicine — they are a proven, durable solution.

For patients missing multiple teeth or facing complex situations, full mouth reconstruction at Vaksman Dental Group can combine implants, crowns, and other restorative approaches into a personalized treatment plan. The right answer depends entirely on your specific situation, which is why a real evaluation matters.

None of this changes when tooth-regrowth technology arrives — but it means you do not need to wait for a future treatment to have a healthy, functional smile today.

7. Protecting the Teeth You Have Right Now Is Still the Most Important Step

Here’s the practical takeaway that every one of these exciting stories quietly implies: none of the tooth-regrowth technologies in development can undo years of decay, bone loss, or gum disease damage. They are all aimed at replacing missing teeth, not at rescuing teeth that were lost to neglect.

The American Dental Association recommends regular professional cleanings and exams as the foundation of keeping your natural teeth for life — and for good reason. MouthHealthy.org has a clear, readable rundown of what adult preventive care actually involves.

At our office in South San Francisco, our dental team uses Pearl AI, an FDA-cleared artificial intelligence system that reviews your digital X-rays alongside our dentists, flagging early signs of decay or bone changes that can be easy to miss on a routine glance. Catching a small cavity early means a simple filling instead of a crown or extraction — and that matters a lot more in the near term than any treatment that is still years from clinical availability.

The science of tooth regeneration is genuinely exciting. But the most reliable way to keep your smile intact is the least glamorous one: show up for your cleanings, catch problems early, and address small issues before they become big ones.

The Bottom Line

Scientists are making real progress on regrowing human teeth, and the USAG-1 drug trial is a legitimate scientific milestone worth following. But a clinically available, FDA-approved tooth-regrowth treatment for everyday patients is likely still many years out. In the meantime, today’s restorative options are excellent, and good preventive care is still the best investment you can make in your long-term oral health.

Frequently Asked Questions

Is there a drug that can regrow teeth in humans?

A Japanese research team completed an early-phase human safety trial for a drug that blocks the USAG-1 protein, which normally suppresses tooth growth. The trial was designed to test safety, not efficacy, so it hasn’t yet confirmed the drug reliably regrows teeth in adult humans. Results so far are promising but preliminary, and broader clinical availability is likely at least several years away.

Can humans really grow a third set of teeth?

Humans carry a dormant “third tooth bud” that is normally suppressed during development. The USAG-1 inhibitor drug is designed to reactivate that bud. In animal models, this produced an extra tooth, but researchers have not yet confirmed that adult humans can grow a complete, well-positioned third tooth through this method. “Third set” is an optimistic framing of early science.

Does tooth-regrowth research mean I can skip dental care for now?

No. Even in the best-case scenario, these treatments would help replace missing teeth, not reverse cavities, gum disease, or bone loss. Preventive care, regular cleanings, and treating small problems early remain the most reliable way to keep your natural teeth healthy for life.

If I’m missing a tooth now, what are my best options?

Today, dental implants are the most durable, natural-feeling option for replacing a single missing tooth, and they work for most healthy adults. For more complex situations, a full mouth reconstruction combines multiple restorative treatments. A consultation with our dental team at Vaksman Dental Group in South San Francisco is the best way to find out which option fits your specific needs and timeline.

Written by the Vaksman Dental Group team and medically reviewed by Dr. Irena Vaksman, DDS — South San Francisco. Last reviewed July 2026.