Tooth regeneration has moved from science fiction to early human trials. A Japanese research team began dosing adult patients with a drug designed to grow new teeth in 2024, and several other approaches are advancing through preclinical and early clinical stages. The field is not at a single breakthrough moment but at a convergence of multiple strategies, from antibody drugs that awaken dormant tooth buds to stem cell implants that rebuild damaged pulp, to synthetic scaffolds that guide new tissue into shape. None of these are available at your dentist’s office yet, but the underlying science has reached a level of sophistication that makes “grow a new tooth” a plausible clinical goal rather than a distant fantasy.
Why You Stopped Growing New Teeth
Most mammals, humans included, get two sets of teeth and no more. Baby teeth come in, permanent teeth replace them, and the biological machinery responsible for making teeth shuts down. The structure responsible for generating new teeth is called the dental lamina, a band of tissue that runs along the jaw. In species that replace teeth continuously, like sharks, this lamina stays active throughout life. In humans and other mammals that get only two sets, the lamina fragments and breaks down after the permanent teeth start forming.
Research on animal models has shown that this regression of the dental lamina is itself a key mechanism that prevents further replacement teeth from developing.1PubMed. Early regression of the dental lamina underlies the development of diphyodont dentitions In other words, your body doesn’t lack the genetic instructions to make more teeth. It actively suppresses them. That insight is what opened the door to modern tooth regeneration research: if the shutdown is an active process, it might be reversible.
Sharks, Stem Cells, and a Shared Genetic Toolkit
Sharks replace their teeth endlessly, sometimes going through tens of thousands over a lifetime. That sounds like it has nothing to do with human dentistry, but researchers have found that the stem cell populations driving shark tooth regeneration share genetic markers with structures that still exist in human jaws. A study comparing shark dental lamina with human tissue found very similar patterns of key stem cell markers, including Sox2 and Bmi1, in both the actively regenerating shark lamina and in resting human dental tissue.2PubMed Central. Shark tooth regeneration reveals common stem cell characters in both human rested lamina and ameloblastoma The genetic toolkit for making teeth hasn’t disappeared in humans. It’s dormant, not deleted.
This finding reinforced what developmental biologists had suspected for years: the signaling pathways that build teeth, particularly the Wnt and BMP pathways, are deeply conserved across species. Wnt signaling plays a role at nearly every stage of tooth development, from the initial budding to crown shaping to root formation.3PubMed Central. Role of the Wnt signaling molecules in the tooth The question became: could you reactivate those pathways in an adult jaw?
An Antibody Drug That Grows New Teeth
The most headline-grabbing approach to tooth regeneration involves a protein called USAG-1. In normal development, USAG-1 acts as a brake on tooth formation. It binds to both BMP and Wnt signaling molecules, suppressing them and ensuring you don’t grow extra teeth. Mice that are genetically missing the USAG-1 protein develop supernumerary teeth, extra ones that sprout from dormant tooth germs the body would normally keep suppressed.4PubMed Central. Anti-USAG-1 therapy for tooth regeneration through enhanced BMP signaling
Researchers at Kyoto University and their collaborators recognized that if you could block USAG-1 with a drug rather than a genetic knockout, you might coax the same extra teeth to grow in animals and eventually in people. They developed neutralizing antibodies against USAG-1 and tested them in mice, including mice bred to model congenital tooth agenesis, a condition where certain teeth never develop. The antibodies rescued tooth formation in those models, essentially restoring teeth that were genetically programmed not to appear.5PubMed. Development of a new antibody drug to treat congenital tooth agenesis
From there, the team developed a humanized version of the antibody suitable for use in people. The initial target population is patients with congenital tooth agenesis, which affects a small fraction of the population for its severe form and roughly one in ten people for partial forms where one or more teeth simply never develop.6PubMed Central. Advances in tooth agenesis and tooth regeneration For these patients, the drug wouldn’t technically “regrow” a lost tooth. It would awaken a tooth germ that was arrested in early development and allow it to finish forming. Whether the same approach could generate entirely new teeth in adults who have lost teeth to decay or trauma remains an open and much harder question.
Rebuilding Dental Pulp with Stem Cells
Growing a whole new tooth from scratch is the ambitious end of the spectrum. A more immediately practical goal is regenerating the living tissue inside existing teeth. When a tooth’s pulp, the soft tissue containing nerves and blood vessels, dies from injury or infection, the tooth becomes brittle and is typically treated with a root canal, which replaces the living tissue with an inert filling. Stem cells from baby teeth, called human deciduous pulp stem cells, have shown they can do better.
In a clinical trial involving 40 patients with pulp necrosis from traumatic injuries, stem cells harvested from the patients’ own shed baby teeth were implanted into the damaged permanent teeth. At twelve months, the implanted teeth showed regeneration of three-dimensional pulp tissue complete with blood vessels and sensory nerves, something that did not occur in the control group receiving conventional treatment. The stem-cell group also showed increased root length and narrowing of the root’s open tip, signs of continued healthy development. Twenty patients followed for two years showed no adverse events.7PubMed. Deciduous autologous tooth stem cells regenerate dental pulp after implantation into injured teeth
This is not regrowing a whole tooth, but it represents one of the few tooth regeneration strategies that has actually been tested in humans with positive results. Dental pulp stem cells have properties that make them especially useful for regenerative medicine: they can produce odontoblasts, the specialized cells that form dentin, and they support the repair of tooth structures from within.8PubMed. Dental pulp stem cells: function, isolation and applications in regenerative medicine
Bioengineered Tooth Germs
If stem cells can rebuild a tooth’s interior, can you go further and engineer an entire tooth from cells in a lab dish? Researchers have been working on this for over a decade. A method developed in Japan created three-dimensional organ germs by combining epithelial and mesenchymal cells, the two cell populations that interact during natural tooth development, in a carefully structured culture system. These bioengineered tooth germs generated structurally correct teeth both in lab culture and after transplantation into animals, where they connected to the host’s blood supply and nerve fibers.9Nature Methods. The development of a bioengineered organ germ method
A later study in dogs pushed this concept closer to clinical relevance. Bioengineered tooth germs constructed from the animals’ own permanent tooth germ cells were transplanted back into the jawbone. The bioengineered teeth erupted through the gum, integrated with the surrounding bone, and achieved functional performance comparable to natural teeth.10PubMed Central. Practical whole-tooth restoration utilizing autologous bioengineered tooth germ transplantation in a postnatal canine model In a separate mouse study, a bioengineered unit combining a mature tooth, periodontal ligament, and alveolar bone was transplanted into a jaw defect and successfully restored chewing function, ligament responsiveness, and even sensitivity to painful stimuli.11PubMed Central. Functional tooth regeneration using a bioengineered tooth unit as a mature organ replacement regenerative therapy
These results are striking, but the approach has a fundamental limitation: it currently relies on having tooth germ cells to start with. In an adult who lost a tooth to decay, those progenitor cells may no longer be available. Scaling from a mouse or dog jaw to a human one also introduces challenges in matching size, shape, and timing. Still, the proof of concept is clear: a tooth assembled in the lab can function as a real tooth in a living jaw.
Fixing Teeth Without Replacing Them
Much of the regeneration field is focused not on growing whole new teeth but on repairing the ones you have. Two of the most active areas involve dentin, the hard tissue beneath enamel, and enamel itself.
Stimulating Dentin Repair
When a cavity reaches the pulp chamber, the body’s natural response is to lay down a thin layer of reparative dentin to wall off the damage. Researchers at King’s College London discovered that small-molecule drugs that inhibit an enzyme called GSK-3 can dramatically amplify this natural repair response. In mouse molars, teeth treated with GSK-3 inhibitors formed on average twice as much mineralized reparative dentin at the injury site compared to untreated controls, and about 1.7 times more than teeth treated with MTA, the current clinical standard for pulp capping.12Scientific Reports. Promotion of natural tooth repair by small molecule GSK3 antagonists One of the drugs tested, Tideglusib, was already in clinical trials for Alzheimer’s disease, raising the possibility of repurposing an existing drug for dental use.13PubMed Central. Drug Repurposing in Dentistry; towards Application of Small Molecules in Dentin Repair
The drugs work by stimulating Wnt signaling in the tooth’s own stem cells, essentially telling them to ramp up dentin production. Follow-up work showed that delivering these inhibitors via a hydrogel could effectively stimulate reparative dentin formation, offering a practical delivery method for clinical use.14PubMed Central. GSK3 Inhibitor-Induced Dentinogenesis Using a Hydrogel The appeal here is enormous: instead of drilling out decay and filling the hole with a synthetic material, a dentist might one day apply a drug-soaked sponge and let the tooth heal itself.
Regrowing Enamel
Enamel is the hardest tissue in the human body, but once lost, it does not regenerate naturally. The cells that produce it, ameloblasts, die after a tooth finishes forming. Researchers are working around this by using synthetic peptides derived from amelogenin, the protein that guides natural enamel formation. In lab experiments on damaged human enamel, an amelogenin-derived peptide built a dense mineralized layer about 10 micrometers thick that structurally resembled healthy enamel and integrated with the underlying tooth surface.15PubMed. Biomimetic Tooth Repair: Amelogenin-Derived Peptide Enables in Vitro Remineralization of Human Enamel
A more recent approach uses a biomimetic protein matrix that, when applied as a coating, triggers the growth of apatite nanocrystals that recreate the microarchitecture of different enamel regions and restore mechanical properties. The researchers highlighted its potential for treating enamel erosion and dental hypersensitivity in clinical settings.16Nature Communications. Biomimetic supramolecular protein matrix restores structure and properties of human dental enamel Neither approach rebuilds enamel to its full original thickness, but for early erosion and sensitivity, even a thin functional layer could reduce the need for crowns and veneers.
3D-Printed Scaffolds and the Architecture Problem
A tooth is not a uniform block of material. It is a layered, graded structure: enamel on the outside, dentin beneath it, pulp at the core, all anchored by periodontal ligament fibers into bone. Regenerating each tissue in isolation is hard enough. Getting them to assemble in the right spatial arrangement is a separate engineering challenge entirely. This is where 3D bioprinting comes in.
Three-dimensional printing allows researchers to build scaffolds with precisely controlled pore sizes, shapes, and connectivity, creating structures with multiple levels of internal architecture. Different biomaterials can be deposited in layers to promote the growth of different tissue types in the right locations.17Advanced Functional Materials. Advances in 3D Bioprinting of Scaffolds for Dental Tissue Engineering and Regeneration Recent work has applied 3D printing to regeneration of pulp, dentin, periodontal ligament, and alveolar bone, with progress across each of those tissue types.18PubMed Central. The 3-dimensional printing for dental tissue regeneration: the state of the art and future challenges
The vision is to print a scaffold shaped like a tooth root, seed it with the appropriate cell populations, and implant it into the jaw where it would mature into a functional tooth. Early versions of this approach have shown that 3D-printed scaffolds can support the formation of pulp-like tissue and osteodentin when loaded with dental pulp stem cells and implanted into animal models.19PubMed. Dental Pulp Stem Cells: Their Potential in Reinnervation and Angiogenesis by Using Scaffolds The technology is evolving quickly, but printing a scaffold that guides multiple distinct tissues into the precise spatial relationships found in a natural tooth remains a significant hurdle.
The Blood Vessel and Nerve Problem
A tooth without a blood supply is just a piece of mineral. And a tooth without nerves cannot signal pain, which sounds appealing until you realize that pain is how your body alerts you to infection, cracks, and excessive bite force. Any regenerated tooth needs to develop its own vascular and neural network, or it will either die or fail to protect itself.
Dental pulp stem cells turn out to be unusually good at promoting both blood vessel growth and nerve regeneration. They secrete a range of growth factors including vascular endothelial growth factor (which drives blood vessel formation) and brain-derived neurotrophic factor and nerve growth factor (which support nerve ingrowth). Even the fluid collected from cultures of these stem cells, without the cells themselves, can promote blood vessel formation when applied to endothelial cells.19PubMed. Dental Pulp Stem Cells: Their Potential in Reinnervation and Angiogenesis by Using Scaffolds During regeneration, a process called sprouting angiogenesis, driven in part by low-oxygen conditions inside the healing tissue, is the main mechanism by which new blood vessels form. Pulp stem cells actively participate in this process, not only by releasing pro-angiogenic signals but also by differentiating into endothelial cells themselves.20PubMed. Pulp Vascularization during Tooth Development, Regeneration, and Therapy
Strategies to enhance this vascularization and nerve regrowth include adding growth factors directly, modifying scaffold materials to better support vessel ingrowth, and using extracellular vesicles, tiny packets of signaling molecules released by cells.21PubMed. Angiogenic and neurogenic potential of dental-derived stem cells for functional pulp regeneration: A narrative review Solving the vascularization problem is not just a nice-to-have. It’s the difference between a regenerated structure that survives long-term and one that fails.
Why a Regenerated Tooth Could Outperform an Implant
Titanium dental implants are remarkably successful. They last decades, they look good, and they restore chewing function. But they have a fundamental limitation that a regenerated tooth would not: implants are bolted directly into bone without a periodontal ligament. The periodontal ligament is a thin layer of connective tissue fibers, laced with blood vessels and nerves, that suspends a natural tooth in its bone socket. It acts as a shock absorber, distributes bite forces, and provides proprioception, the sense of how hard you’re biting and where.22bioRxiv. Engineering Proprioceptive Implants via Surgical and Regenerative Approaches: Preliminary Interpretations
Implants skip all of this. They fuse directly to bone in a process called osseointegration, which is strong but rigid. Implant patients often report that they can’t feel bite pressure as precisely as with natural teeth. Over decades, the bone around an implant can resorb unpredictably, and peri-implantitis, an inflammatory condition around the implant, is a growing clinical concern. The bioengineered tooth units tested in mouse models restored periodontal ligament function, including responsiveness to mechanical stress and noxious stimuli, something no current implant can offer.11PubMed Central. Functional tooth regeneration using a bioengineered tooth unit as a mature organ replacement regenerative therapy
Rat studies have also shown that periodontal progenitor cells seeded onto tooth root surfaces can regenerate new periodontal fibers and achieve stable reattachment over six months.23PubMed Central. Successful periodontal ligament regeneration by periodontal progenitor preseeding on natural tooth root surfaces If regenerated teeth could come with their own functional ligament, they would restore something implants fundamentally cannot.
The Case for Saving Your Own Teeth
Even before whole-tooth regeneration arrives, the economic picture favors keeping natural teeth whenever possible. A ten-year randomized trial comparing periodontal regeneration of severely compromised teeth against extraction and implant replacement found that regeneration was the more economical option throughout the entire follow-up period, with significantly lower cumulative costs.24PubMed Central. Periodontal regeneration versus extraction and dental implant or prosthetic replacement of teeth severely compromised by attachment loss to the apex A separate analysis of molars with furcation involvement found that implant-supported crowns, despite needing retreatment less often early on, were the most costly strategy overall and were retained for shorter periods than natural teeth treated with periodontal therapy, regardless of the severity of bone loss, patient age, or smoking status.25PubMed. Retaining or replacing molars with furcation involvement: a cost-effectiveness comparison of different strategies
This context matters for tooth regeneration research because it suggests that even partial regenerative approaches, treatments that keep a damaged tooth alive and functional rather than replacing it, could provide significant clinical and financial benefits. The GSK-3 inhibitor dentin-repair approach and enamel remineralization strategies both fall into this category. They may arrive in clinics well before a whole bioengineered tooth does, and they could shift the calculus of when extraction is truly necessary.
What Is Actually in the Regulatory Pipeline
Despite the promising lab results, the regulatory path for tooth regeneration therapies is steep. Most of these approaches involve living cells, gene-targeting antibodies, or complex scaffold-cell combinations, all of which fall under the category of advanced therapy medicinal products. A review of the regulatory landscape found that while authorities have been developing pathways to address unmet patient needs in this area, the field remains in early development. Scientific uncertainties, regulatory complexity, and unresolved cost-effectiveness questions all present substantial barriers to getting these products approved and into clinical use.26PubMed. Prospects of Advanced Therapy Medicinal Products-Based Therapies in Regenerative Dentistry
The anti-USAG-1 antibody is furthest along for a specific and narrow use: treating people born without certain teeth. For broader applications like regrowing teeth lost to age, injury, or disease, the timeline is much less certain. Manufacturing living cell products at scale, ensuring consistent quality, storing and shipping biological therapies to dental offices, and demonstrating long-term safety all represent challenges that go well beyond proving the basic science works. The history of regenerative medicine in other fields, from skin grafts to cartilage repair, suggests that the gap between a successful animal study and a widely available clinical product is measured in decades rather than years. But the science is no longer theoretical, and the number of independent research groups converging on the problem has grown considerably. For the first time, the question is not whether we can regrow teeth but how soon the various pieces will come together in a form that a patient can actually receive.