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If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens.

Seoul Bardi Dental Clinic · ✅ 강동구 상일동역 서울바르디치과 · April 16, 2026

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. Hello, I’m the director of Seoul Vardi Dental Clinic. "The backmost molar is h...

AI translation notice

This page is an English translation of a Korean Naver Blog archive entry. For exact wording and source context, verify against the Korean archive original and the original Naver post.

Clinic: Seoul Bardi Dental Clinic

Original post date: April 16, 2026

Translated at: April 19, 2026 at 1:34 PM

Medical note: This translation does not guarantee medical accuracy or suitability for treatment decisions.

Hello,

I’m the director of Seoul Vardi Dental Clinic.

"The backmost molar is hard to brush,

and it’s not easy to see, so I end up brushing it carelessly."

"It had a dull ache sometimes,

but then the tooth suddenly broke..."

If you are reading this now,

you may also be looking for a solution

with a sense of shock because of sudden pain.

Because the backmost molar is located

in the deepest part of the mouth,

brushing it is difficult, so surprisingly many people

end up leaving it unattended.

As a result, without realizing it,

it can easily be exposed to cavities and gum disease.

Today, based on a real case,

I’ll go over everything about the treatment process

for the backmost molar.^^

  1. Why does the backmost molar especially tend to decay? If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens.

Even if you try to put the toothbrush deep into your mouth,

the shape of the oral cavity makes it very hard for the brush head to reach the very end, right?

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 1

Because of that, food debris keeps accumulating

on the back of the tooth.

As this debris builds up,

a cavity starts on the back side surface of the tooth (distal surface).

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 2

This area is very close to the jawbone, so even if the cavity

progresses only a little,

it can quickly affect the nerve and the jawbone.

The problem is that this area is not even visible in the mirror,

so by the time a patient comes in because of pain,

root canal treatment or extraction is often already unavoidable ㅠㅠ

  1. A patient case who came in with pain in the backmost molar If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. "The tooth at the very back has been hurting since three days ago.. I can’t even sleep..."

This is a case of a patient who recently visited the clinic with severe pain in the lower left molar.

When we looked inside the mouth, the lower left backmost molar (#37)

was already broken,

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 3

and the upper molar on the opposite side (#27)

had only the root left.

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 4

In fact, when we examined the X-ray and CT scans,

the situation was even more serious.

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 5

The lower molar (#37) already had decay that had

reached the nerve,

and especially the bone behind the tooth had already

deeply deteriorated from inflammation.

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 6

The upper molar also had inflammation spreading all the way to the root tip.

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 7

Treatment plan

Even for me, who is sincerely committed to saving natural teeth,

I wanted to save them as much as possible, but ㅜㅜ

Because the bone loss from inflammation was too extensive,

we unfortunately decided to proceed with extraction followed by implants.

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 8 If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 9

Both teeth had severe bone loss,

so bone grafting was necessary.

For the lower molar (#37), we safely performed bone grafting

while considering the distance from the nerve canal,

but the real challenge was the upper molar (#27).

In the backmost upper molar area, there is an anatomical structure

called the "maxillary sinus," which is an empty cavity.

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 10

250526

When placing an implant,

it is important to operate without damaging this maxillary sinus.

However, this patient had very thin bone,

and there was almost no foundation to support an implant....

In this case, bone grafting combined with a sinus lift procedure

is needed.

What is a sinus lift procedure? If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens.

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 11 If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 12

This is a highly advanced procedure in which the very thin,

eggshell-like membrane of the maxillary sinus is lifted upward,

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 13 If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 14

and then bone is artificially filled into that space.

Because the membrane can tear with even a slight mistake,

the medical team’s skill determines the success of the procedure!

Fortunately, the surgery was completed well without major issues.^^

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 15

After two months, we confirmed that the bone had solidly healed

and finished with a zirconia restoration.

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 16 If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 17

Now, without worrying about throbbing pain,

the patient can eat freely with the backmost molar,

which was also a very rewarding case for me. ^^

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens. image 18 251113

The backmost molar is often already too late by the time you think,

"If it hurts, I’ll go in."

Even if it looks fine on the outside, inflammation that is

melting the bone may be progressing on the hidden side.

The most important thing is thorough brushing,

but regular checkups that let us look into areas you can’t see are truly the surest way

to protect your precious natural teeth.

I will honestly tell you what treatment is truly needed now,

without unnecessary treatment.

Thank you. ^^

▼Check the clinic location▼

If you lightly brush your backmost molar because the toothbrush can’t reach it, this is what happens.

Go to make a reservation call
02-481-4278

| This post was written directly by Seoul Vardi Dental Clinic for the purpose of providing medical information in compliance with Article 56, Paragraph 1 of the Medical Advertising Act. The information provided is recommended for reference only, and for symptom assessment and accurate management methods, please visit a medical institution and receive guidance from medical staff. All procedures / surgeries performed at the dental clinic may involve individual risks (inflammation, bleeding, swelling, etc.). Please make your decision after sufficient consultation with medical staff in advance. The treatment cases in this post were photographed with the consent of patients who completed treatment at our clinic, and the before-and-after photos were taken under the same conditions. |

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