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Published September 2026

1 of 5In a young tooth, the root tip hasn't finished growing, so it's still open
  1. In a young tooth, the root tip hasn't finished growing, so it's still open
  2. There's nothing yet for a normal filling to seal against
  3. Medicine is sealed inside instead, and changed at visits over weeks or months
  4. That medicine helps the root close or keep growing a wall to seal against
  5. Once there is a wall to seal to, the root canal is finished, resealed for good

Who usually does it

endodontist. Usually referred to an endodontist or pediatric dentist.

One question worth asking

How many visits does this take, and how far apart are they?

Pulp regeneration, medicine change

Root canalsMajorFor childrenD3356

D3356. A middle visit where the medicine is replaced.

A young adult tooth whose root has not finished growing cannot get a normal root canal. These multi-visit treatments place medicine inside the root to help it close or keep growing, then finish the root canal later.

In a young adult tooth the tip of the root is still open, so there is nothing for a normal filling to seal against. Medicine is sealed inside the tooth for weeks or months to encourage the root to close or keep growing, with visits in between to change it, and the root canal is finished once there is a wall to seal to. Most plans file this as Major. What they actually pay varies by plan.

Codes for this

D3351MajorRoot-end closure treatment, first visitThe first visit, where medicine is placed inside the root to help the tip close.per tooth · Rarely doneD3352MajorRoot-end closure treatment, medicine changeA middle visit where the medicine is replaced.per tooth · Rarely doneD3353MajorRoot-end closure treatment, final visitThe last visit, where the root canal is finished and sealed.per tooth · Rarely doneD3355MajorPulp regeneration, first visitThe first visit of a treatment that tries to regrow living tissue inside a young tooth.per tooth · Rarely doneD3356MajorPulp regeneration, medicine changeA middle visit where the medicine is replaced.per tooth · Rarely doneD3357MajorPulp regeneration, final visitThe last visit that seals the tooth.per tooth · Rarely done
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Related

Pulp regeneration, medicine change (D3356): what happens, step by step | TruthMolar