![\"\"](\"https:\/\/tenver.com\/wp-content\/uploads\/2026\/08\/teeth4-1024x683.png\")
<\/figure>\n\n\n\nThat idea eventually led to a humanized antibody called TRG035. Rather than implanting an artificial tooth or engineering one outside the body, the experimental treatment is designed to neutralize USAG-1 and potentially allow a tooth that failed to develop to resume its natural developmental program.<\/p>\n\n\n\n
So, can a person who loses a tooth simply receive an injection and grow a new one? Not yet. The first human study of TRG035 was designed primarily to test safety, not to prove that the drug can regrow lost teeth. And the treatment\u2019s first intended target is much narrower: people born with missing teeth, a condition known as congenital tooth agenesis.<\/p>\n\n\n\n
Why start with people who were born without certain teeth? Because in some forms of congenital tooth agenesis, the biological machinery for making a tooth may not be entirely absent\u2014it may have started and then stalled. Researchers describe these as developmentally arrested tooth germs. By blocking USAG-1, they hope to release that developmental brake and allow some of those tooth germs to continue growing.<\/p>\n\n\n\n
Here is where the story becomes even more intriguing. Humans normally develop two sets of teeth\u2014baby teeth and permanent teeth. But researchers have long observed evidence of what they call a \u201cthird dentition\u201d: rudimentary tooth structures that can sometimes develop beyond the normal permanent set. In rare cases, these structures may help explain why some people develop extra, or supernumerary, teeth.<\/p>\n\n\n\n
The Japanese researchers wondered whether this largely dormant third set could someday be deliberately awakened. In ferrets, whose two-stage dental pattern has similarities to ours, a USAG-1-neutralizing antibody produced an additional whole tooth resembling a third dentition. That result was striking\u2014but it was still an animal experiment, not proof that the same thing will happen in humans.<\/p>\n\n\n\n
Could This Eventually Replace Dental Implants?<\/strong><\/h2>\n\n\n\nPossibly\u2014but that is a much bigger leap. Today\u2019s dental implants replace a missing tooth with an artificial structure. Regenerative dentistry aims at something fundamentally different: persuading the body to produce a living tooth of its own. If that ever becomes reliable and controllable, it could transform dentistry. But TRG035 has not yet been shown to regenerate ordinary adult teeth lost to decay, gum disease, injury, or aging.<\/p>\n\n\n\n
That distinction matters. A treatment that helps a developmentally arrested tooth grow is not the same as routinely replacing any tooth lost decades later. Researchers would still need to determine whether a new tooth can be generated in the right location, with the right shape and size, properly aligned with neighboring teeth, and safely integrated with bone, nerves, and the bite.<\/p>\n\n\n\n
Where Things Stand Now<\/strong><\/h2>\n\n\n\nThe program has completed its initial Phase I safety study in adults, which was designed primarily to evaluate the safety and dosing of TRG035\u2014not to prove that people could grow new teeth.<\/p>\n\n\n\n
The next test will be far more consequential. In August 2026, Japan\u2019s PMDA completed its review of the clinical trial notification for a Phase IIa study of TRG035 in patients with congenital tooth agenesis, clearing an important regulatory step toward the next stage of clinical testing. The study must still proceed through the necessary institutional and clinical steps before it can provide the answer everyone ultimately cares about: can blocking USAG-1 actually restore missing teeth in people?<\/p>\n\n\n\n
What We Know\u2014and What We Don\u2019t<\/h2>\n\n\n\n
What we know is genuinely exciting. Scientists have identified a biological pathway capable of influencing tooth formation, demonstrated tooth restoration or additional tooth formation in animal models, developed a humanized antibody targeting that pathway, and moved the treatment into human clinical development.<\/p>\n\n\n\n
What we do not know is equally important. No peer-reviewed evidence has yet shown TRG035 growing a new tooth in a human being. We do not yet know how reliably a regenerated tooth could be positioned, shaped, controlled, or whether this approach will ever work for ordinary tooth loss later in life. Those questions remain open.<\/p>\n\n\n\n
The TENVER View<\/h2>\n\n\n\n
Tooth regeneration is no longer merely a science-fiction idea. There is real biology behind it, years of animal research behind it, and now a drug candidate in human clinical development. That alone makes this a story worth watching.<\/strong><\/p>\n\n\n\nBut the most exciting possibility\u2014the day when an ordinary adult could replace a lost tooth by growing a new one\u2014remains a possibility, not a medical reality. The science has opened a door. It has not yet shown us what lies on the other side.<\/p>\n\n\n\n
Key Papers & Sources<\/h2>\n\n\n\n
1. Murashima-Suginami A, et al. (2008)<\/strong>
Enhanced BMP signaling results in supernumerary tooth formation in USAG-1 deficient mouse<\/a><\/em>
Biochemical and Biophysical Research Communications<\/strong>
An early study showing that mice lacking USAG-1 developed supernumerary teeth, helping establish USAG-1 as an important regulator of tooth formation.<\/p>\n\n\n\n2. Murashima-Suginami A, et al. (2008)<\/strong>
Enhanced BMP signaling results in supernumerary tooth formation in USAG-1 deficient mouse<\/a><\/em>
Biochemical and Biophysical Research Communications, 369(4), 1012\u20131016<\/strong>
This study showed that enhanced BMP signaling contributes to supernumerary tooth formation in USAG-1-deficient mice and helped clarify the signaling mechanism behind the earlier finding.<\/p>\n\n\n\n3. Murashima-Suginami A, et al. (2021)<\/strong>
Anti\u2013USAG-1 therapy for tooth regeneration through enhanced BMP signaling<\/a><\/em>
Science Advances, 7(7), eabf1798<\/strong>
This landmark study showed that blocking USAG-1 with an antibody could rescue tooth agenesis in mouse models and induce whole-tooth formation. The researchers also demonstrated additional tooth formation resembling a third dentition in ferrets.<\/p>\n\n\n\n4. Takahashi K, et al. (2024)<\/strong>
Development of a new antibody drug to treat congenital tooth agenesis<\/a><\/em>
This paper describes the development of a humanized anti-USAG-1 antibody and the scientific path toward clinical treatment for congenital tooth agenesis.<\/p>\n\n\n\n
The program has completed its initial Phase I safety study in adults, which was designed primarily to evaluate the safety and dosing of TRG035\u2014not to prove that people could grow new teeth.<\/p>\n\n\n\n
The next test will be far more consequential. In August 2026, Japan\u2019s PMDA completed its review of the clinical trial notification for a Phase IIa study of TRG035 in patients with congenital tooth agenesis, clearing an important regulatory step toward the next stage of clinical testing. The study must still proceed through the necessary institutional and clinical steps before it can provide the answer everyone ultimately cares about: can blocking USAG-1 actually restore missing teeth in people?<\/p>\n\n\n\n
What We Know\u2014and What We Don\u2019t<\/h2>\n\n\n\n
What we know is genuinely exciting. Scientists have identified a biological pathway capable of influencing tooth formation, demonstrated tooth restoration or additional tooth formation in animal models, developed a humanized antibody targeting that pathway, and moved the treatment into human clinical development.<\/p>\n\n\n\n
What we do not know is equally important. No peer-reviewed evidence has yet shown TRG035 growing a new tooth in a human being. We do not yet know how reliably a regenerated tooth could be positioned, shaped, controlled, or whether this approach will ever work for ordinary tooth loss later in life. Those questions remain open.<\/p>\n\n\n\n
The TENVER View<\/h2>\n\n\n\n
Tooth regeneration is no longer merely a science-fiction idea. There is real biology behind it, years of animal research behind it, and now a drug candidate in human clinical development. That alone makes this a story worth watching.<\/strong><\/p>\n\n\n\n But the most exciting possibility\u2014the day when an ordinary adult could replace a lost tooth by growing a new one\u2014remains a possibility, not a medical reality. The science has opened a door. It has not yet shown us what lies on the other side.<\/p>\n\n\n\n 1. Murashima-Suginami A, et al. (2008)<\/strong> 2. Murashima-Suginami A, et al. (2008)<\/strong> 3. Murashima-Suginami A, et al. (2021)<\/strong> 4. Takahashi K, et al. (2024)<\/strong>Key Papers & Sources<\/h2>\n\n\n\n
Enhanced BMP signaling results in supernumerary tooth formation in USAG-1 deficient mouse<\/a><\/em>
Biochemical and Biophysical Research Communications<\/strong>
An early study showing that mice lacking USAG-1 developed supernumerary teeth, helping establish USAG-1 as an important regulator of tooth formation.<\/p>\n\n\n\n
Enhanced BMP signaling results in supernumerary tooth formation in USAG-1 deficient mouse<\/a><\/em>
Biochemical and Biophysical Research Communications, 369(4), 1012\u20131016<\/strong>
This study showed that enhanced BMP signaling contributes to supernumerary tooth formation in USAG-1-deficient mice and helped clarify the signaling mechanism behind the earlier finding.<\/p>\n\n\n\n
Anti\u2013USAG-1 therapy for tooth regeneration through enhanced BMP signaling<\/a><\/em>
Science Advances, 7(7), eabf1798<\/strong>
This landmark study showed that blocking USAG-1 with an antibody could rescue tooth agenesis in mouse models and induce whole-tooth formation. The researchers also demonstrated additional tooth formation resembling a third dentition in ferrets.<\/p>\n\n\n\n
Development of a new antibody drug to treat congenital tooth agenesis<\/a><\/em>
This paper describes the development of a humanized anti-USAG-1 antibody and the scientific path toward clinical treatment for congenital tooth agenesis.<\/p>\n\n\n\n