• 03-5413-7912

    By appointment only
    (operating hours 9:30~12:30/14:00~17:30 )

  • Directly connected to Roppongi Sta. Midtown Tower 6F

    Office hours: Mon-Sat 9:30~12:30/14:00~17:30
    Closed on Sundays and Holidays

Contact us


By appointment only
(operating hours 9:30~12:30/14:00~17:30 )

Contact Us

Treatment of tooth decay

Treatment of tooth decay

Minimal treatment with early detection

Once adults lose our teeth, they never return to their original state. Not only they are dissolved by acid produced by bacteria in the mouth, but tooth structure removed by cavity treatment will not regenerate. For this reason, early detection and treatment of tooth decay is of utmost importance.

The sooner you find cavities, the less we would cut the tooth structure. In particular, we focus on conservative treatment with as little cutting as possible. We strive to preserve as much of the patient’s own teeth as possible and minimize damage.

Caries treatment by stage

Treatment of tooth decay Toothache, sesitive tooth

Tap to enlarge

The treatment of decayed teeth depends on the stage of progression.

Treatment in C0(signs of tooth decay)

C0 is an early stage of tooth decay and does not involve holes in the tooth surface. The only characteristic of this stage is the development of “white stains” described as white spots or cloudiness. There is no need to drill the teeth, and fluoride is applied to promote remineralization. You will be advised how to brush so as to improve your hygiene.

Treatment of C1 (mild caries)

C1 is a cavity in the enamel. It is a relatively shallow hole on the tooth surface. It does not cause pain at this stage, but in some cases, cold objects may sting. The treatment is completed by drilling away the bacterial-infested tooth structure and filling it with a composite resin.

Treatment in C2 (moderate caries)

C2 is a dentin cavity. The holes in the tooth surface tend to be relatively deep and large. Cold and sweet foods can induce a “toothache”. After the lesion is shaved, treatment is completed with the fabrication and application of a filling or cover.

Treatment of C3 (Severe tooth decay)

C3 is a cavity that has reached the pulp of the tooth. The nerve of the tooth has been affected and this causes severe pain. The pain can be induced by hot as well as cold and sweet foods. A spontaneous pain called “zing zing” may occur even at rest.
The treatment is completed by removing the nerve of the tooth, performing a root canal, and fabricating and fitting a covering.

Treatment of C4 (The most severely decayed tooth)

C4 is the terminal stage of tooth decay. The crown, which is the head of the tooth, collapses and only the root of the tooth remains. Because the nerve is dead, you won’t feel any pain. In most cases, when it has progressed to this point, tooth extraction is indicated. Once the tooth has been extracted, the missing tooth is replaced with a prosthetic, such as a bridge, denture or implant.

Other service lists

Recommended treatments

Comprehensive Oral Examination

For those who want early detection and treatment of tooth decay.

See details


when you want to maintain your oral conditions frequently.

See details

Root canal treatment

For those who are worried about worsening or recurrent worm teeth.

See details

Do you have these symptoms?

Each of our doctors has honed the skills and developed expertise in Japan or abroad.
We will work closely with you on your concerns.
Please feel free to consult with us.

Contact Us

Please feel free to contact us to make an appointment for a consultation
or to ask questions about your treatment.


You can call by tapping the number

  • By appointment only

  • Operating hours

  • Office Hours

  • Mon-Sat: 9:30~12:30

  • Closed

  • Sundays and Holidays

Office hours Mon Tue Wed Thu Fri Sat Sun/



9-7-1 Akasaka, Minato-ku, Tokyo 107-6206, Japan
Midtown Tower 6F

・ Directly connected to Roppongi Station on the Tokyo Metro Hibiya Line and Toei Subway Oedo Line.

・ 7 minutes walk from Nogizaka Station (exit 3) on the Tokyo Metro Chiyoda Line

・ Eight-minute walk from Roppongi 1-chome Station (Exit 1) on the Tokyo Metro Namboku Line

Terrestrial map

Tokyo Midtown Dental Clinic : Access map

*Tap to enlarge

Click to enlarge
We are looking for staff to work with us.:recruit banner
To topage