Was It the Gum or the Nerve? It Was Both

Quick answer: A tooth with both a deep gum pocket and a dead nerve is a combined perio-endo lesion. Which problem came first determines the treatment order and the prognosis — and the sequence is almost always root canal first, gum treatment second.

The call

Yitzchak, 56, from Sheinfeld, had been having on-and-off swelling around a lower molar for three months. His hygienist had treated it as a gum problem and deep-cleaned it twice. It improved each time and came back each time.

He arrived frustrated and half-convinced he was being sold repeat appointments that were not working.

What we found

Lower left first molar. Probing depths of 9mm on the tongue side and 8mm between the roots, against 3mm elsewhere in the mouth. Pus on probing. The tooth was slightly mobile.

Then the finding nobody had checked: it gave no response to cold or electric pulp testing. The nerve was dead.

On the x-ray, bone loss ran the full length of the root, and there was also a distinct lesion at the root tip and in the furcation, the space between the roots.

So which came first? It matters, because the answer determines what to treat and in what order.

A primary endodontic lesion starts with a dead nerve. Infection exits the root tip or a small side canal and tracks up alongside the root, producing a narrow, isolated deep pocket beside otherwise healthy gum. Root canal treatment alone usually resolves it, and the bone fills back in.

A primary periodontal lesion starts with gum disease. Bone loss progresses down the root over years, eventually reaching the root tip and killing the nerve from the outside in. Pockets are generally wide, and there is gum disease elsewhere in the mouth too.

A true combined lesion is both, arrived at independently, meeting in the middle.

His mouth was largely healthy elsewhere — 3mm pockets everywhere else, minimal bleeding. That pointed strongly to an endodontic origin with secondary periodontal involvement: the dead nerve came first, and the chronic drainage up the side of the root had destroyed the attachment over time.

What we did

Root canal treatment first, without exception. Deep-cleaning a pocket that is being fed by an infected root canal is treating the smoke rather than the fire, which is exactly why his previous treatments kept relieving and relapsing.

Two visits: full removal of the necrotic pulp, thorough irrigation, calcium hydroxide dressing for four weeks, then filling the canals.

Then we waited three months before touching the gum. This is the part that requires patience. Bone lost to an endodontic infection often regenerates substantially once the source is removed, and aggressive deep cleaning in the meantime can strip away attachment that would have healed on its own.

At three months we re-probed. The 9mm pocket had reduced to 4mm. Only light maintenance cleaning was needed. No surgery.

The outcome

Crowned at four months. Three years on, pockets remain 3 to 4mm, the tooth is firm and the furcation lesion has substantially filled in on x-ray.

What to do if this happens to you

1. Ask whether the nerve has been tested if you have a deep pocket at one tooth. It is a two-minute test and it is frequently skipped.
2. Notice whether the problem is one tooth or many. One isolated deep pocket in an otherwise healthy mouth suggests a nerve problem.
3. Ask about treatment order. Root canal first, gum treatment later, is the standard sequence.
4. Be patient after the root canal. Bone takes months to fill in, and re-probing too early gives a misleading picture.
5. Do not accept repeated deep cleanings at the same site without a diagnosis.
6. Ask for the prognosis honestly. True combined lesions have a poorer outlook than endodontic ones.

A deep pocket at one tooth that keeps coming back? Ramat Beit Shemesh Urgent Dental Care tests the nerve before treating the gum. 055-985-8845 · WhatsApp https://wa.me/972559858845 · Harav Kook 28/1, Beit Shemesh.

Based on real cases treated at the clinic. Names have been changed.