Analysis
Each piece reads a primary source and explains what it does and does not show. We publish only what the evidence supports, and we never take a press release at its word.
Whole exome sequencing of 18 patients with congenitally missing teeth found known agenesis genes in 12; in the 6 without one, all carried an EPB41L4A splice variant, and BLAST-based cluster analysis groups the gene with established tooth-loss genes. Hypothesis-generating only.
In Lake Malawi cichlids, plucking teeth from one jaw half tripled the local replacement rate, and single-nucleus RNA-seq across the first week mapped progenitor states, an immune handoff, and the signaling sequence that rebuilds a tooth.
In the mouse incisor, Sox2-positive epithelial stem cells exist before their niche does; actomyosin tension at the advancing epithelial edge keeps them confined and undifferentiated until the niche matures, a design constraint for engineered tooth germs.
A Journal of Dentistry meta-analysis of preclinical DPSC extracellular vesicle studies reports consistent odontogenic and anti-inflammatory signals, but heterogeneity in isolation, dosing, and readouts leaves the route without an effectiveness estimate or any clinical data.
In 56 mechanically exposed dog teeth, collagen-soaked tideglusib capping caused more inflammation and pulp disorganization than MTA and produced no hard-tissue bridge, a negative in vivo result for the leading dentin-repair small molecule.
Biomaterials study pairs lipopolysaccharide-preconditioned dental follicle stem cell small extracellular vesicles with an adhesive, antibacterial hydrogel and reports periodontal tissue regeneration in a rat defect model; every readout is preclinical and the abstract states no quantified endpoints.
A preprint identifies Foxp4+ skeletal stem cells in mouse and human mandible that form Meckel's cartilage, bone and tooth germ mesenchyme; purified human cells transplanted into immunodeficient mouse nasal sinus assembled an ectopic tooth, though never in a jaw socket.
In nude mice carrying human dentin root segments packed with H19-overexpressing pulp stem cells, the lncRNA H19 built more dentin-like tissue and vascularized pulp-like stroma by repressing miR-103a-3p, releasing PIK3R1/AKT and KLF4 in a route parallel to H19/miR-140-5p/BMP2.
Mouse study combining trigeminal ganglion co-culture, bead-based factor tests, and single-cell sequencing identifies SPP1-ITGA4 as the route by which sensory nerve signals drive odontoblast differentiation, sharpening the innervation gap in root organoid design.
In a mouse ectopic root graft fed with SHED conditioned medium, Wnt10a expression peaks early in regenerating pulp-like tissue as microvessels form, then falls as vessels mature, supporting its use as a temporal biomarker of pulp regeneration.
In a rat pulp injury model, raising histone acetylation at the FKBP5 promoter with the HDAC inhibitor vorinostat increased reparative dentin formation, and FKBP5 gain or loss in pulp stem cells moved dentin matrix protein expression in step.
Reanalysis of single-cell data plus two macrophage-depletion models in mice shows tooth germ macrophages form a provascular niche and are required for vascular maturation and normal cusp patterning, without markedly changing vessel density.
Extracellular vesicles from stem cells of exfoliated deciduous teeth reduced inflammatory cytokines, apoptosis, and mitochondrial damage in LPS-inflamed human pulp cells and damped inflammation in a 3-day rat pulpitis model, an effect a cell-free therapy would need to build on.
Single-cell, proteomic, and metabolomic data from human pulp converge on glutathione metabolism, and in a mouse molar injury model, glutathione administration enhanced tertiary dentin formation while activating mitophagy pathways in the injured pulp.
Liu and colleagues evolve a DNA aptamer against human dental pulp stem cells; the Pt-1-high subset out-proliferates and out-mineralizes the rest, and a Pt-1 hydrogel draws host cells into transplanted root fragments and rat femur defects.
A transgenic zebrafish injury model shows retinoic acid signaling, especially its synthesis enzyme aldh1a2, is required for repair of ablated tooth germ cells, and that only retinoic acid itself, not its precursors, accelerates recovery.
Genetic and drug-based macrophage depletion in mice caused malformed, slow-to-erupt teeth and reversible dentin-enamel defects in adults, showing tooth macrophages are a required part of the developing and continuously renewing tooth.
In human dental pulp stem cells, blocking integrin adhesion with cilengitide blunts Jagged1-driven mineralization, but silencing integrin beta3 alone does not, suggesting the Notch ligand works through broader adhesion signaling than one subunit.
Tao and colleagues load lithium-calcium-silicate particles into a photo-cured gelatin hydrogel; in rat molar pulp defects it performs similarly to the commercial cap iRoot BP on mineralized repair and adds nerve-fiber staining, showing more ingrowth than blank or plain-GelMA defects.
Zhang et al. identify Grem2 as a marker for a distinct mouse dental-follicle stem cell subset that contributes to interradicular alveolar bone, periodontal ligament, and cementoblasts, and show that Grem2 loss produces a taurodontism-like phenotype through disrupted BMP and IGF2 signaling.
In human dental pulp stem cells, miR-129-5p is downregulated during osteogenic induction; blocking it boosts proliferation and mineralization, while overexpression suppresses both, pointing to a possible tuning target for pulp-dentin repair.
Li et al. use human umbilical vein endothelial cell exosomes as a miR-21 delivery vehicle and show that elevated miR-21 enhances adhesion, proliferation, migration, and capillary-like tube formation in human dental pulp stem cells through the JAG1/NOTCH1/VEGF pathway.
A Sichuan University team identifies NFATC1 dysfunction as an in vivo driver of tooth aging: in mice it sends dental pulp MSCs into senescence, slashes reparative dentin, and a dasatinib-plus-quercetin senolytic regimen restores repair capacity.
A Brazilian group shows that conditioned medium from stem cells of the apical papilla, primed with the omega-3 mediator DHA, increases rat pulp cell mineralization and shrinks periapical lesions in a rat endodontic model, without lowering bacterial counts.
Birjandi and Sharpe isolate small extracellular vesicles and secretome from mouse E14.5 tooth germ mesenchyme, show they shift epithelial Wnt and integrin signaling, and find the treated epithelium still cannot form a tooth when recombined with non-inductive mesenchyme.
Bi and colleagues reanalyze published mouse molar single-cell data into a 30,951-cell atlas, resolving 4,323 dental epithelial cells into seven subpopulations and identifying a hybrid epithelial-mesenchymal matrix organizer during the crown-to-root transition.
In stem cells from apical papilla, nuclear PRMT6 deposits a repressive histone mark on the DKK1 promoter, dampening β-catenin signaling and blocking mineralization; deleting its nuclear localization sequence keeps PRMT6 cytoplasmic and restores differentiation.
Li et al. isolate extracellular vesicles from a CD24+ human dental papilla subpopulation and show that they triple vascular density and promote organized, DSPP-positive pulp-like tissue in a subcutaneous mouse model, supporting a cell-assisted EV strategy for pulp regeneration.
Liang et al. use rapidly degrading oxidized alginate microgels to pack human dental stem cells into self-condensing aggregates and reconstitute mouse embryonic epithelial-mesenchymal tooth germs, producing vascularized bone-like tissue under the renal capsule but not a calcified tooth.
A February 2026 review combines a public gingival single-cell atlas and protein-network data to localize USAG-1 expression, while restating the TRG-035 clinical timeline the registry has not yet confirmed.
A rat pulp-capping study finds that adding an anchovy nano-extract to calcium hydroxide increases odontoblast-like cells and macrophage ALP expression, but the work is preclinical and the active ingredient is unspecified.
Ke et al. show that Foxq1 binds the Wnt5a and Dspp promoters to polarize dental papilla stem cells and generate tubular dentine-like tissue on acellular human scaffolds in mice, but only where a pre-existing dentine opening is present.
In mice, macrophages are required for normal root elongation and periodontal ligament maturation; their early postnatal loss expands Gli1+ mesenchymal progenitors but blocks their osteogenic differentiation via reduced TGF-β signaling.
A single-cell atlas of miniature pig tooth germs identifies MFAP5 as an extracellular-matrix cue that, via ITGA5 and ERK/MAPK, promotes odontoblast differentiation and mineralization in human dental pulp stem cells.
A Nantes team formulates lipoxin A4 in a nanoemulsion that is fully stable for 45 days, polarizes macrophages toward an M2 phenotype, and suppresses IL6 and IL1β in a rat molar pulpitis model.
A supramolecular elastin-like recombinamer matrix nucleates epitaxial apatite growth on acid-etched human enamel and dentine ex vivo, restoring stiffness, hardness, and wear resistance in tests that simulate years of toothbrushing and chewing.
Mouse dental mesenchyme already knows its lingual-buccal address at the cap stage; lingual cells make tooth, buccal cells make supporting bone, and the split is maintained after dissociation and reaggregation.
A Sichuan University team reports a serum-free, chemically defined culture in which reconstituted mouse tooth germs self-organize into toothoids, continue development, and deposit enamel after BMP activation. The cells keep their original developmental stage.
A Brazilian group decellularized swine coronal pulp from erupted first molars and developing second molars; the developing pulp yielded about three times more matrix per tooth and retained mineralized deposits after decellularization, while DNA fell more than 92% in both groups.
Zebrafish scpp5 is needed for developmental tooth mineralization and accelerates injury-induced dentin repair, but the same Wnt/β-catenin signal rescues dentin without fixing enameloid, pointing to separable developmental and repair mechanisms.
Zhang and Yelick report that recellularized decellularized porcine tooth bud scaffolds produced tooth-like mineralized tissues in 50-62% of adult minipig implants, while acellular and natural tooth bud controls fared worse.
A narrative review of 2020-2026 organoid literature concludes tooth-germ organoids are one of the most advanced systems for epithelial-mesenchymal whole-organ formation, while flagging vascularization, immune integration, and cell sourcing as persistent translation barriers.
A light-curable tideglusib-loaded methacrylated hyaluronic acid hydrogel released drug in zero-order fashion and, with adjunct low-intensity focused ultrasound, increased BMP2 expression and mineralized matrix formation in cultured human dental pulp stem cells.
Adult Japanese fire-bellied newts rebuilt the anterior half of the lower jaw after amputation, restoring bone, Meckel's cartilage, and a functional dentition within 64 weeks via membranous ossification, transient cartilage expansion, and dental lamina-driven tooth renewal.
A Panax notoginseng saponin, NGR1, drove human dental pulp stem cells toward odontogenic markers in vitro and produced more organized reparative dentin in adult dogs after direct pulp capping, with transcriptomics pointing to S100A9 and stress-response pathways.
A 24-month case report in the International Endodontic Journal reports blood perfusion and pulp-like MRI signal in a mature necrotic canine after regenerative endodontics plus apical microsurgery, with hard-tissue deposition but no proof of histological pulp regeneration.
A Journal of Oral Biosciences paper funded by Toregem BioPharma reports an imaging biomarker, combining MRI and CT/X-rays, that visualized the dental lamina and pre-calcified tooth germ in ferret pups, a step toward measurable endpoints for tooth regeneration trials.
In patient-derived epithelial tooth organoids, amoxicillin and the chemotherapy drugs vinblastine and vincristine reduced maturation-stage enamel markers while cell viability stayed above 50 percent, strengthening the organoid as a human model for developmental enamel defects.
In cultured human dental pulp stem cells, platelet-rich fibrin countered CEM cytotoxicity and amplified MTA support for viability and stemness genes, but the work never left the dish.
Vesicles from a person's own dental pulp stem cells beat vesicles from their own blood plasma on proliferation and every differentiation marker tested, but the comparison never left the culture dish.
Punicalagin, a pomegranate-peel polyphenol, raised four dentin markers in human pulp stem cells at 5 micromolar and cut inflammation in rat pulpitis; a single DKK-1 block ties part of the effect to canonical Wnt signaling.
Five human samples per group linked deep caries to softer pulp. Hydrogels then tied stiffness to exosome release and odontogenic markers, but no animal tooth tested whether changing stiffness repairs dentin.
A Showa University group induces the founder oral epithelium from human iPSCs in 10 days by turning SHH on and holding BMP down, but stops one step short: these cells are not yet shown to form tooth germ or enamel.
Engineered DLL4 replaced odontoblast contact during human ameloblast maturation. Treated organoids secreted enamel proteins and mineralized ectopically, but one proof-of-concept scan and no native tooth leave enamel structure and function unanswered.
A 50 nM DNA nanostructure raised four odontogenic markers in reprogrammed human pulp cells. Ectopic root segments made DSPP-positive tissue, but missing cell-only and nanostructure-only controls leave the causal claim open.
Only one narrow laser setting, Nd:YAG at 60 J/cm2, beat the EDTA control for TGF-beta1 release; higher energy and the 635 nm diode did worse, and the readout is release into buffer, not pulp regeneration.
A single-lab in vitro study calls a viscoelastic scaffold favorable, yet the same scaffold sharply upregulates the canonical fibrosis pathway (SMAD3 fold change 40.66) that regenerative endodontics is trying to avoid.
The advance is a culture medium, not a new tooth: it preserves embryonic mouse mesenchyme's odontogenic competence for about 14 days, and the result that adding BMP4 blocks tooth formation runs opposite to the anti-USAG-1 route for a reason.
In human pulp stem cells, adding the deubiquitinase OTUB1 raised odontogenic markers and, in a rat pulp, dentin; deleting its target TPM1 or blocking autophagy erased the gain, marking a specific pathway rather than a therapy.
In one Pittsburgh lab's scaffold-free human dental stem cell system, shrinking the starting construct scrambled the tooth root-like layering of dentin, cementum, and pulp tissue, pointing to a minimum cell mass for proper patterning.
A registered single-center trial in 20 adult molars reports 2.5 cubic millimeters more dentin bridge with platelet-rich fibrin than MTA, but the primary p value is 0.049 and the reported test statistic does not match the stated methods.
A preprint reports that extracellular vesicles from hypoxia-preconditioned pulp stem cells outperform standard vesicles in vitro and in a rat ectopic model, and names two miRNAs as candidate drivers. It has not been peer reviewed.
In one child followed for 80 months, the revitalized incisor that matured faster early was not the tooth that stayed healthy, and the paper's abstract and its case record disagree on which scaffold led at 12 months.
The Phase I record shows a single ascending dose tolerated in adults. It says nothing about growing teeth in anyone, and the Phase II population is children with congenital agenesis, not adults.
In 150 panoramic radiographs, people missing teeth on one side only showed higher jaw asymmetry indices than controls or bilateral cases, especially with posterior or mandibular agenesis.
In a case-control radiograph study, mandibular tooth agenesis affected 10.3% of a nonsyndromic cleft cohort versus 4.9% of controls, concentrated in cleft palate and cleft lip and palate, and in the second premolar.
A review in Development synthesizes what lineage tracing, single cell sequencing and organoid models have shown about lifelong tooth renewal, and names the two mechanisms still unresolved.
A narrative review in Biologics contrasts transplanting cells against recruiting the body's own cells to a scaffold, and places nearly all therapeutically viable work inside the tooth, not a new one.
Delivering GLUT1 and HK2 mRNA into aged dental pulp stem cells restored their angiogenic signaling to immature-cell levels in vitro, and matched immature cells' vessel density in a tooth root slice model.
Applying 100 to 300 mV/mm electric fields to dental pulp stem cells altered proliferation, migration and stemness gene expression, and selectively boosted bone/dentin and vessel lineage markers, not neural ones.
A PRISMA meta-analysis of 10 animal studies (45 animals, 393 teeth) found platelet derivatives no better than a blood clot scaffold in regenerative endodontics, and mostly bone-like tissue, not pulp, in both.
A narrative review argues that the postnatal day 7 to 19 rat molar tooth germ captures physiological root dentinogenesis, HERS elongation through mineralization, without the inflammatory confounders of infection-based models.
Two patients received autologous DPSC grafts for nonvital mature teeth with apical periodontitis and root perforation; sensibility returned by 4 and 12 weeks, lesions resolved on imaging by 48 weeks, with no adverse events to 96 weeks.
Single-cell and spatial profiling of the aging mouse incisor implicates Lypd1+ fibroblast progenitors, macrophage-derived PDGFB, and 11beta-HSD2-driven corticosteroid signaling in age-related pulp fibrosis; blocking the axis reduced fibrosis in vivo.
In a pilot of four human pulp samples, one tooth diagnosed as irreversible pulpitis showed a molecular profile resembling reversible disease, with PTN and CXCL14 among candidate markers of a reversible-like state.
A preprint finds SHED expand more stably than adult dental pulp stem cells and that their secreted cues activate a neuroprotective program in developing chick retinal neurons. Nothing dental was tested.
A comprehensive review organizes hydrogel-based scaffold strategies for regenerating the dentin-pulp complex. It is a map of preclinical work, not new data, and it moves no program tier.
Whole exome sequencing of six congenital tooth agenesis patients against five controls, combined with expression and in silico analyses, nominates candidate genes and pathways. Small, hypothesis-generating, no functional validation reported.
Resin composites combining nano alpha-tricalcium phosphate with silver nanoparticles induced odontogenic differentiation and mineralization in human dental pulp stem cells in vitro. A materials result, not an animal or human one.
Two case reports describe regenerative management of traumatized immature permanent incisors in young children, the anatomy that makes these teeth fracture-prone being the reason the procedure exists. Uncontrolled human data, two patients.
A defined CD24+ subset of human dental papilla cells regenerated vascularized pulp and integrated dentin in mouse and minipig models, beating conventional dental pulp stem cells, via a BMP2/SIRT1 mechanism.
A narrative review traces human dental follicle cell research from its 2005 inception, covering isolation, characterization, cultivation, and proposed uses in dentistry and immunotherapy. It adds no new data.
A narrative review of enamel remineralizing agents confirms fluoride works through fluorapatite but is limited by calcium and phosphate bioavailability, with biomimetic agents as the proposed next step.
In 30 patients with unilateral third molar elongation versus 30 controls, a CBCT study examined links to TMJ space asymmetry and uneven posterior tooth wear. Cross-sectional imaging can associate, not explain.
iPSCs from a hypohidrotic ectodermal dysplasia pedigree carrying a KDF1 mutation showed defects after embryoid body differentiation, pointing beyond the known EDA/EDAR pathway. A disease model, not a therapy.