How Stem Cells and Hydrogels Are Regrowing Jawbone

Quick answer: Researchers are combining stem cells with hydrogel scaffolds to regrow lost jawbone tissue. The stem cells develop into bone-forming cells, while the injectable hydrogel holds them in place and supports new growth. Early clinical trials report significant bone regrowth within six months, hinting at a less invasive alternative to traditional bone grafts.

For decades, losing jawbone meant facing painful grafts, synthetic implants, or dentures. Bone simply doesn’t grow back on its own once disease or extraction takes its toll. But that long-standing rule is starting to bend.

Scientists are now pairing two powerful tools—stem cells and hydrogels—to coax the jaw into rebuilding itself. The approach is part of regenerative dentistry, a field that aims to heal tissue from within rather than patch over the damage. Instead of bolting in a titanium implant, the goal is to grow real, living bone.

This post breaks down how the science works, what recent studies have found, and what it could mean for patients who have run out of good options.

Why jawbone loss is such a stubborn problem

Periodontal disease, the leading cause of jawbone loss, affects nearly half of adults over 30, according to data cited by Grand Lake Dental. When gum disease advances, it eats away at the alveolar bone that anchors teeth. Tooth extraction and trauma can do the same.

The trouble is that jawbone doesn’t regenerate naturally. Once it’s gone, patients usually need bone grafts to rebuild enough structure for an implant. Grafts work, but they can be painful, require additional surgery, and carry a risk of rejection.

That gap—between losing bone and having limited ways to restore it—is exactly what regenerative dentistry is trying to close.

What are stem cells, and which ones matter in dentistry?

Stem cells are undifferentiated cells that can transform into specialized tissues like bone, dentin, or nerve. In dentistry, several types stand out:

• Dental pulp stem cells (DPSCs): First identified by Gronthos and colleagues in 2000, these cells live in the soft interior of teeth. DPSCs can differentiate into odontoblast-like cells, osteoblasts (bone-forming cells), and neural-like cells.
• Stem cells from exfoliated deciduous teeth (SHED): Sourced from baby teeth, making them easy to collect.
• Periodontal ligament stem cells (PDLSCs): Found in the tissue connecting teeth to the jawbone.
• Gingival mesenchymal stem cells (GMSCs): Harvested from gum tissue.
• Mesenchymal stem cells (MSCs): Often drawn from bone marrow, these are central to several jawbone trials.

What makes dental stem cells especially appealing is their accessibility. Many can be collected from extracted or naturally shed teeth, sidestepping the ethical debates tied to other sources.

How do hydrogels help stem cells regrow bone?

Stem cells can’t rebuild bone alone—they need the right environment. That’s where hydrogels come in.

A hydrogel is a 3D network of polymer chains that can absorb large amounts of water. Because its structure resembles living tissue, it makes an ideal scaffold for delivering cells to a damaged area. The hydrogel holds stem cells in place, gives them room to multiply, and guides them as they form new tissue.

Hydrogels carry a practical advantage too: many are injectable. Rather than open surgery, a clinician can inject the gel directly into the defect, making the procedure far less invasive.

There has been one persistent hurdle. Standard hydrogels have small pores, which limits how well transplanted cells survive and expand. Solving that pore problem has been a major focus of recent research.

What does the latest research show?

Several institutions have reported encouraging results.

UCLA School of Dentistry tackled the pore-size problem head-on. As published in Nature Communications (2019), a team led by Min Lee, PhD, developed a clay-enhanced hydrogel. By inserting the gel into layers of naturally occurring clay—a process called intercalation chemistry—the researchers created a far more porous material. When injected into a mouse with a non-healing skull defect, the hydrogel triggered significant bone healing within six weeks, driven by the body’s own naturally occurring stem cells. Notably, this worked without expensive biological agents that can cause side effects.

The University of Pennsylvania moved the concept toward patients. A 2025 clinical trial is testing a hydrogel infused with mesenchymal stem cells to regenerate jawbone in people with severe periodontal damage. Once injected, the gel acts as a scaffold for the stem cells to multiply and turn into osteoblasts. Early results show significant bone regrowth within six months—potentially reducing the need for invasive grafting.

USC’s Ostrow School of Dentistry offers the broader framework. In a January 2026 article, Mehdi Mohammadi, DDS, explained that regenerative dental therapies rest on three interrelated components: stem cells that can become dental and supporting tissues, bioactive signaling molecules like growth factors, and scaffolds that provide 3D structure. Preclinical and early clinical studies, he noted, show that combining dental stem cells with bioactive scaffolds can regenerate pulp-like tissue, periodontal ligament, and alveolar bone.

The pace of related breakthroughs is striking. Grand Lake Dental highlights a 2024 MIT project that produced a “smart” biomaterial capable of releasing growth factors on demand, triggered by the body’s inflammatory response to injury.

How is this different from traditional bone grafts?

Choosing between a regenerative approach and a conventional graft comes down to what matters most for the patient.

• Choose a traditional graft if you need a proven, widely available option today. Grafts have a long track record and are accessible at most clinics.
• Watch the regenerative approach if minimizing surgery and rebuilding living tissue matter most. Injectable hydrogel-and-stem-cell therapies are less invasive and aim to grow the patient’s own bone, but most remain in clinical trials rather than routine practice.

It’s worth being clear: outside of trials like Penn’s, these therapies are not yet standard care. The science is promising, but it’s still maturing.

What are the challenges ahead?

The path from lab to dentist’s chair isn’t simple. Scaling up from animal models to humans is technically demanding, since human tissues are more complex. Regulatory approval for stem cell therapies is famously strict. And cost is a real concern—early treatments are likely to be expensive until they become more common.

Still, the direction is clear. As 3D bioprinting allows patient-specific scaffolds and AI helps predict stem cell behavior, regenerative dentistry is steadily moving from concept toward clinic.

The takeaway for patients and practitioners

Regenerative dentistry marks a genuine shift—from repairing damage to rebuilding biology. Stem cells supply the raw material, hydrogels provide the structure, and growth factors direct the process. Together, they’re already regrowing jawbone in early trials.

If you’re a patient facing bone loss, ask your dentist or periodontist whether any regenerative options or clinical trials apply to your case. If you’re a practitioner, keeping an eye on trials from institutions like UCLA and the University of Pennsylvania will help you advise patients as these therapies move closer to everyday use.

Frequently asked questions

Can stem cells really regrow jawbone in humans?
Early evidence says yes, with caution. A 2025 University of Pennsylvania clinical trial using a stem-cell-infused hydrogel reported significant jawbone regrowth within six months in patients with severe periodontal damage. However, most of these therapies are still in trials rather than routine clinical use.

What is a hydrogel, and why is it used with stem cells?
A hydrogel is a water-rich, 3D network of polymer chains that mimics living tissue. It acts as a scaffold that holds stem cells in place, supports their growth, and guides them as they form new bone. Many hydrogels are injectable, which makes treatment less invasive than surgery.

Which stem cells are used to regrow bone in dentistry?
Mesenchymal stem cells (often from bone marrow) feature in several jawbone trials. Dental pulp stem cells, periodontal ligament stem cells, gingival mesenchymal stem cells, and stem cells from exfoliated baby teeth are also widely studied because many can be collected from teeth and gum tissue.

Is this treatment available at my dentist now?
Generally, no. As of these studies, stem-cell-and-hydrogel jawbone regeneration is mostly limited to clinical trials and research settings. Traditional bone grafts and implants remain the standard options for now.

How is this better than a traditional bone graft?
The potential advantages are that it’s less invasive—often injectable rather than surgical—and aims to grow the patient’s own living bone rather than relying on graft material. The trade-off is that it’s newer, less widely available, and likely more expensive in its early stages.

What are the main risks and challenges?
Key hurdles include scaling results from animal studies to humans, meeting strict regulatory standards for stem cell therapies, and high early costs. These factors mean wider availability will likely take time.