Regenerative Endodontics:
Letting Young Teeth Finish Growing
When a permanent tooth is injured before its root is fully formed, a conventional root canal leaves the tooth weak and brittle. Regenerative endodontics is a biologically-based alternative that lets the root keep developing — preserving the tooth for the patient's whole life.
When Is It Appropriate?
Regenerative endodontics is specifically for young permanent teeth — typically ages 7–18 — whose root has not yet fully formed but whose pulp has died from trauma, a deep cavity, or developmental defect.
Good Candidates
- •Patient under ~18 years old
- •Permanent tooth with an open apex (incomplete root)
- •Pulp has died (necrotic) — usually after trauma or deep decay
- •Tooth is otherwise restorable
- •Patient and family can return for staged visits
Not a Candidate
- •Adult tooth with fully-formed root (use conventional root canal)
- •Tooth that's structurally too damaged to restore
- •Patient with conditions that contraindicate the medication used
- •Tooth with a vertical root fracture
How the Procedure Works
A regenerative endodontic procedure typically takes two visits, several weeks apart.
Visit 1 — Disinfection
Under local anesthesia and a rubber dam, we open the tooth and gently clean the inside of the canal using a low-pressure irrigation solution that disinfects without damaging the delicate stem cells at the root tip. We then place an antibiotic medication inside the canal and seal it with a temporary filling.
Healing Period (2–4 weeks)
The antibiotic medication continues working for several weeks to fully eliminate infection. The tooth is left undisturbed during this time so the surrounding tissues can begin healing.
Visit 2 — Inducing Regeneration
We re-anesthetize, remove the medication, and gently introduce a small amount of bleeding from the tissues at the root tip into the canal. This blood clot is rich in stem cells and growth factors — the biological material needed to regenerate vital tissue inside the tooth.
Sealing the Tooth
We place a layer of MTA (mineral trioxide aggregate) over the blood clot to seal the top of the canal, then a permanent restoration over that. The body's own healing response then takes over.
Long-Term Follow-Up
We monitor with X-rays at 6 months, 12 months, and annually. Over time, the root continues to develop — the canal walls thicken and the root tip closes. The tooth becomes stronger and is much less likely to fracture later in life.
Why It Matters Long-Term
An immature tooth that receives a conventional root canal (called apexification) has thin, fragile walls and a high lifetime risk of fracture — sometimes within a few years. Regenerative treatment changes that.
Conventional Apexification
- • Root growth stops permanently
- • Walls remain thin — high fracture risk
- • Hollow tube of material inside
- • Tooth often lost to fracture in 5–15 years
Regenerative Endodontics
- • Root continues developing
- • Canal walls thicken — stronger tooth
- • Vital tissue inside the canal
- • Greater likelihood of lifelong tooth retention
Frequently Asked Questions
How long does the whole process take?
Two appointments, 2–4 weeks apart, each lasting about 60 minutes. Then follow-up X-rays at 6, 12, and 24 months to confirm continued root development.
Is it painful?
No more than a regular root canal. Both visits are done under local anesthesia. Most patients have no significant discomfort afterward.
Will the tooth ever turn dark?
Some discoloration is possible, particularly if MTA is placed too high in the crown. We use newer materials and techniques to minimize this risk. If discoloration does occur, it can usually be addressed cosmetically.
What if it doesn't work?
If regeneration doesn't proceed as hoped, we can fall back to a conventional apexification procedure — the tooth still has a good chance of being saved. We'd much rather try regeneration first because the upside is so much better long-term.
Is this experimental?
No — regenerative endodontics is now a recognized treatment with extensive published research and is included in the American Association of Endodontists clinical guidelines. It's been performed for over 15 years with well-documented outcomes.
What the evidence shows
We offer regenerative endodontics only where the published evidence supports it, and we are honest about what it can and cannot do — there is no product or device we promote here:
- Regenerative endodontic procedures are reserved for immature permanent teeth with a necrotic pulp and an open apex — disinfection, induced bleeding into the canal, and a coronal seal aim to restore vitality signs and let the root keep developing.[1]
- In suitable immature teeth, revascularization can produce continued root lengthening and thickening of thin dentinal walls — outcomes conventional apexification cannot achieve.[2]
- Published protocols still vary in irrigant, intracanal medicament, and scaffold, so we follow the current AAE Clinical Considerations and adapt as the evidence matures rather than promising a fixed result.[3][4]
Regenerative endodontics — serving 30+ Bay Area cities
Dr. Jason Kung provides regenerative endodontics to patients across Silicon Valley from our Sunnyvale office. Evening and weekend hours, same-day emergencies, free on-site parking.
Worried About Your Child's Tooth?
If your child or teen has had a tooth injury or a deep cavity in a young permanent tooth, ask your dentist about a regenerative consultation. We work closely with referring dentists and pediatric dentists across the South Bay.
Mon–Fri 8am–7pm · Sat–Sun 8am–3pm