ＤＵＯ大阪歯科医院 (DUO Osaka Dental Clinic)
According to our open methodology, this clinic scored 75.6/100 for transparency, reputation, service accessibility, and digital visibility.
Overall rank: #6 of 21 ranked clinics · Last checked: 6 September 2026
Positions by Rating Profile
- Overall Transparency & Trust#675.6/100
- Best for Expats#870.5/100
- Best for Dental Implants#673.8/100
- Best for Emergency Dental Carenot ranked
- Best Price Transparency#580.3/100
- Best English-speaking Clinics#869.8/100
- Best for Families / Children#671.8/100
- Sleep Dentistry (GA / deep sedation)not ranked
General Anaesthesia & Deep Sedation
Whether the clinic documents treatment under general anaesthesia or deep / twilight sedation — "sleep dentistry", where the patient is asleep and unaware (does not feel, see, or hear the procedure). Ordinary conscious sedation, where the patient stays awake and responsive, does not count here. This is informational and does not affect the transparency score.
- ? General anaesthesia / deep sedation (sleep dentistry) — Not verified
Summary
Two-specialist practice in the Nakanoshima Mitsui Building, built around a periodontist certified by the European Federation of Periodontology after three years at the University of Gothenburg and an endodontist who trained for two years at the University of Pennsylvania. Both state on the site that they work in English. The clinic keeps a full English section, publishes a tax-exclusive private-fee table covering consultation, CT imaging, periodontal regeneration, implants, aesthetic restorations, gold work and whitening, and documents an Asahi cone-beam CT and a Carl Zeiss microscope. Its declared stance is tooth preservation over replacement; it is open weekdays only.
Strengths
- Information Transparency: 20 of 20 points.
- Price Transparency: 13 of 15 points.
- No red flags identified in public sources.
Weaknesses
No category fell below the weakness threshold (50% of verifiable points).
Score Breakdown
Every criterion below is scored from public sources. ✓ verified yes · ✗ verified no / not found · ◐ partial · ? unverified (scores 0, not a negative finding).
Information Transparency
Whether basic facts about the clinic - its team, premises, services, and location - are publicly verifiable.
| ✓ | Has a working website [s1] | 4/4 |
| ✓ | Dentist names listed Dr. Motohiro Otsuki (principal) and Dr. Toshihiro Ushikubo, both listed as English-speaking dentists. [s2] | 3/3 |
| ✓ | Dentist specializations listed EFP-certified periodontist and implantologist (University of Gothenburg specialist programme, Japanese Society of Periodontology specialist, Japanese Academy of Clinical Periodontology supervising dentist); endodontist trained at the University of Pennsylvania. [s2] [s5] | 2/2 |
| ✓ | Real clinic photos [s6] | 2/2 |
| ✓ | Service list published Tooth-preservation treatment, second opinion, periodontal disease, endodontics, implants, peri-implantitis, aesthetic dentistry, cleaning, whitening, caries, paediatric dentistry, dentures and wisdom-tooth extraction. [s1] [s4] | 3/3 |
| ✓ | Clear contact details [s1] [s7] | 2/2 |
| ✓ | English website version English section with periodontics, endodontics, implant and access pages. [s5] | 2/2 |
| ✓ | Address and map published [s7] | 2/2 |
Price Transparency
Whether patients can estimate costs before visiting. Published price ranges count; exact prices are not required.
| ✓ | Prices or price ranges published Permanent private-fee table (tax exclusive) across diagnosis, periodontal regeneration, implants, aesthetic restoration, gold restorations and whitening. [s3] | 3/3 |
| ✗ | Cleaning price listed Cleaning is offered but not priced in the published fee table. [s3] | 0/2 |
| ✓ | Filling price listed Direct composite resin filling JPY 30,000; porcelain inlay JPY 80,000; hybrid inlay from JPY 50,000. [s3] | 2/2 |
| ✓ | Crown price listed Porcelain-fused crown JPY 120,000; all-ceramic and zirconia crowns JPY 150,000; hybrid ceramic from JPY 90,000; gold crown from JPY 120,000. [s3] | 2/2 |
| ✓ | Implant price listed Implant placement from JPY 250,000, second-stage surgery from JPY 30,000, abutment JPY 100,000, bone augmentation JPY 100,000-300,000. [s3] | 2/2 |
| ✓ | Consultation price listed Second-opinion consultation JPY 20,000 per 60 minutes; caries-risk assessment JPY 4,000. [s3] | 2/2 |
| ✓ | X-ray / imaging price listed CT scan alone JPY 10,000; the facility page adds that CT is covered by health insurance in some cases. [s3] | 2/2 |
Reputation & Reviews
Public review signals. The Google rating is adjusted with a Bayesian prior (rating 4.0, weight 25) so a 5.0 from a handful of reviews does not outrank a 4.8 from hundreds.
| ◐ | Google rating (Bayesian-adjusted) Star histogram read live on 2026-09-06 from the place page: 86 five-star, 2 four-star, 2 three-star, 3 two-star, 10 one-star. The buckets sum to 103, matching the 103 in the place-page header exactly, and the weighted mean 4.466 reproduces the published 4.5. [gmp1] | 4/6 |
| ◐ | Google review volume Read live on 2026-09-06 from the place-page header; the star histogram sums to the same figure. [gmp1] | 2/3 |
| ✓ | Review recency The newest review visible is 3 months old, which proves the within-3-months bucket and no better. Sample: the 3 reviews Google Maps renders on the place page in its own relevance order. A newest-first sort was not available; re-checking the Reviews tab returned the same three reviews, so no fresher slice is available. [gmp1] | 3/3 |
| ✗ | Clinic responds to reviews None of the 17 reviews read on Google carries an owner reply, including the 12 dated 2025-02-25 to 2026-09-29. [duo-osaka-dental-clinic-nakanoshima-osaka-deepen] | 0/2 |
| ✓ | No recurring complaints None of the three reviews Google renders is critical. The histogram carries thirteen ratings of two stars or below out of 103 (12.6 per cent) that the visible sample cannot reach, so this reading rests on the sample. Sample: the 3 reviews Google Maps renders on the place page in its own relevance order. A newest-first sort was not available; re-checking the Reviews tab returned the same three reviews, so no fresher slice is available. [gmp1] | 2/2 |
| ✓ | No suspicious review patterns Histogram shape, spread of wording and dates, and reviewer-account variety show no sign of manipulation. Sample: the 3 reviews Google Maps renders on the place page in its own relevance order. A newest-first sort was not available; re-checking the Reviews tab returned the same three reviews, so no fresher slice is available. [gmp1] | 2/2 |
| ✗ | Active Facebook presence The clinic's Facebook page has had no post since July 2022 and has eight reviews; the clinic's website duo-dental.com is its working channel. [duo-osaka-dental-clinic-nakanoshima-osaka-presence-4] | 0/1 |
| ? | TripAdvisor presence | 0/0.5 |
| ✗ | Other review platforms No review profile on the Japanese review sites: Caloo lists it only from the public register, with no review; EPARK Dental and WhatClinic have no page for it (checked 2026-10-02). [duo-osaka-dental-clinic-nakanoshima-osaka-presence] [duo-osaka-dental-clinic-nakanoshima-osaka-presence-2] [duo-osaka-dental-clinic-nakanoshima-osaka-presence-3] | 0/0.5 |
Medical Infrastructure
The range of publicly documented equipment and services. This measures documented availability, not clinical quality.
| ✓ | On-site X-ray [s6] | 2/2 |
| ✓ | CBCT (3D imaging) Asahi Roentgen AZ3000CT cone-beam CT documented on the facility page. [s6] | 2/2 |
| ✓ | Implantology [s1] [s3] | 2/2 |
| ✗ | Orthodontics Not on the clinic's published service list; declared specialties in the Kinki Regional Bureau of Health and Welfare designation list are general dentistry, oral surgery and paediatric dentistry, without orthodontics. [s1] [reg4] | 0/2 |
| ✓ | Oral surgery Periodontal surgery, bone augmentation and wisdom-tooth extraction. [s1] [s3] | 2/2 |
| ✓ | Pediatric dentistry Paediatric dentistry on the clinic's own service list and among its declared specialties. [s1] [reg4] | 1.5/1.5 |
| ? | Emergency care | 0/1.5 |
| ✓ | Works with international patients English section written for patients from abroad; both specialists state they work in English. [s5] | 2/2 |
Communication & Service
How easy it is to contact the clinic, get answers, and book - especially for international patients.
| ? | WhatsApp / LINE available | 0/2 |
| ? | Response speed | 0/1.5 |
| ✓ | English spoken Both named dentists are flagged "English speaking dentist" on the clinic's own staff page; the English section states the whole team can speak English. [s5] [s2] | 2.5/2.5 |
| ✓ | Pre-visit consultation possible Web booking for first visits and a priced second-opinion consultation. [s1] [s3] | 1.5/1.5 |
| ✓ | Clear service explanations [s1] [s6] | 1/1 |
| ✗ | Convenient opening hours Weekdays only, 10:00-13:30 and 15:00-19:00; closed Saturdays, Sundays and public holidays. [s6] | 0/1.5 |
AI & Search Visibility
Whether the clinic is discoverable when patients search - including via AI assistants. Checked with fixed queries: "best dentist Japan", "English speaking dentist Japan", "dental implants Japan", "emergency dentist Japan", "Japan dental clinic for expats".
| ✓ | Mentioned for: best dentist Japan Web search 2026-09-06: named as "An English and Japanese speaking dental clinic located in Nakanoshima, Osaka" in the answer for "best dentist Osaka", citing its own site duo-dental.com/english/. [q1] | 1/1 |
| ✗ | Mentioned for: English speaking dentist Japan Web search 2026-09-06: not among results for "English speaking dentist Osaka" (named results were Yutaka Dental Clinic, Minatomachi Dental Clinic, Osaka Dental Clinic, NINE DENTAL CLINIC, Seo Dental Clinic, OsakaDentist.com). [q2] | 0/1 |
| ✓ | Mentioned for: dental implants Japan Web search 2026-09-06: its own implants page (duo-dental.com/english/implant.htm, titled "Implant/osaka DUO specialists dental clinic") appeared among results for "dental implants Osaka", though the answer text summarized Osaka Dental University Hospital, ZAGA Center Osaka, and Smile Plan by name instead. [q3] | 1/1 |
| ✗ | Mentioned for: emergency dentist Japan Web search 2026-09-06: not among results for "emergency dentist Osaka" (named results were Osaka Shinsaibashi Evening Dental, NINE DENTAL CLINIC, Yanagida Dental Clinic/OsakaDentist.com, Fujita Dental Clinic, Esaka Dental Clinic). [q4] | 0/1 |
| ✗ | Mentioned for: Japan dental clinic for expats Web search 2026-09-06: not among results for "Osaka dental clinic for expats" (named results were Y & Y Dental Clinic, Kono Dental Clinic, Minatomachi Dental Clinic, NINE DENTAL Clinic, OsakaDentist.com, Tokuoka Dental Clinic). [q5] | 0/1 |
| ✗ | Structured data on website No JSON-LD or microdata found in the served HTML. [s1] | 0/1.5 |
| ✓ | Google indexing quality own domain duo-dental.com takes the top 2 results plus 3 more dedicated pages (homepage, fee schedule, case study) behind only one directory listing; two unrelated results (diploma-mill spam pages) fill the bottom of the page (web search 2026-09-07) [giq1] | 2/2 |
| ✓ | Dedicated service pages Separate pages for periodontics, implants, facility standards, fees and access. [s1] | 1.5/1.5 |
Licensing & Credentials
Whether the clinic publishes its operating licence and the dentists working there together with their professional licence numbers. A verified “not published” is recorded as a red flag; data we have not checked yet is shown as unverified and carries no penalty.
Clinic operating licence: Institution code 41-07499 — designated health-insurance dental clinic, designation date 2013-10-01 (Heisei 25), declared specialties dentistry, oral and maxillofacial surgery and paediatric dentistry, per the Kinki Regional Bureau of Health and Welfare Osaka dental designation list as of 2026-09-01 (Reiwa 8); founder and chairman of the operating medical corporation: Toshihiro Ushikubo; managing dentist: Motohiro Otsuki. Also registered as a dental clinic in the MHLW Healthcare Information Net under facility code 3270072220, record last updated 2026/1/26. The clinic separately publishes the reimbursement facility standards it has filed with the regional bureau of health. [reg1] [reg4] [s8]
Dentists & MHLW register entry
| Dentist | Specialization | MHLW entry | Notes |
|---|---|---|---|
| 大月 基弘 (Dr. Motohiro Otsuki) [s2] [reg1] [reg3] [reg4] | Principal and managing dentist; EFP-certified specialist in periodontology and implant dentistry, board-certified specialist of the Japanese Society of Periodontology, certified instructor of the Japanese Society of Clinical Periodontology, PhD in Dentistry (Osaka University) | not published | Confirmed on the public register of 厚生労働省; registered since 1999, no licence number is published. |
| 牛窪 敏博 (Dr. Toshihiro Ushikubo) [s2] [s5] [reg3] | Endodontics; two-year programme at the University of Pennsylvania; chairman of the medical corporation operating this clinic (Ushikubo Dental) | not found in the public register (checked 4 September 2026) | — |
One or more named dentists could not be found in the public register on the date checked — recorded as unverified, no penalty.
Red Flags
No red flags identified in the public sources we reviewed.
Data We Could Not Verify
- Reputation & Reviews: TripAdvisor presence
- Medical Infrastructure: Emergency care
- Communication & Service: WhatsApp / LINE available
- Communication & Service: Response speed
Unverified items score 0 points but are not treated as negative findings. If you can document any of them, please send a correction.
Contact Information
| Website | https://www.duo-dental.com/ |
|---|---|
| Phone | +81 6-6136-6480 |
| Google Maps | Map listing |
| Address | 〒530-0005 大阪府大阪市北区中之島3-3-3 中之島三井ビルディング1階 (Nakanoshima Mitsui Building 1F, 3-3-3 Nakanoshima, Kita-ku, Osaka 530-0005) |
Contact details are provided for identification only and may change; verify with the clinic directly.
Sources
| ID | Source | What it supports | Accessed |
|---|---|---|---|
| s1 | https://www.duo-dental.com/ | Clinic name, address, phone, service list, positioning | 2026-09-04 |
| s2 | https://www.duo-dental.com/staff.htm | Named dentists, qualifications and English-speaking flags | 2026-09-04 |
| s3 | https://www.duo-dental.com/fee.htm | Private-treatment fee table | 2026-09-04 |
| s4 | https://www.duo-dental.com/perio.htm | Periodontal treatment page | 2026-09-04 |
| s5 | https://www.duo-dental.com/english/ | English-language section, specialist training and English-language service | 2026-09-04 |
| s6 | https://www.duo-dental.com/clinic.htm | Opening hours, cone-beam CT, microscope, premises photographs | 2026-09-04 |
| s7 | https://www.duo-dental.com/access.htm | Address, map and directions | 2026-09-04 |
| s8 | https://www.duo-dental.com/shisetsu.htm | Reimbursement facility standards the clinic has filed with the regional bureau of health | 2026-09-04 |
| reg1 | https://www.iryou.teikyouseido.mhlw.go.jp/znk-web/juminkanja/S2430/… | MHLW Healthcare Information Net (Navii) — the statutory facility register kept under Medical Care Act Article 6-3: official name, operator, managing dentist Motohiro Otsuki, address, phone, last updated 2026/1/26 | 2026-09-04 |
| reg3 | https://licenseif.mhlw.go.jp/search_isei/jsp/top.jsp | MHLW physician/dentist qualification confirmation search (dentist register), snapshot 2026-09-04 | 2026-09-04 |
| reg4 | https://kouseikyoku.mhlw.go.jp/kinki/tyousa/shinkishitei.html | Kinki Regional Bureau of Health and Welfare Osaka dental designation list as of 2026-09-01: institution code 41-07499, founder, managing dentist, declared specialties and designation date | 2026-09-04 |
| gmp1 | https://www.google.com/maps/place/DUO%E3%83%87%E3%83%B3%E3%82%BF%E3… | Live Google Maps place page read in a browser: rating, review count, star histogram, review dates, owner replies, listing website, phone, address and pin coordinates | 2026-09-06 |
| q1 | search:best dentist Osaka | AI/search visibility scout — canonical query | 2026-09-06 |
| q2 | search:English speaking dentist Osaka | AI/search visibility scout — canonical query | 2026-09-06 |
| q3 | search:dental implants Osaka | AI/search visibility scout — canonical query | 2026-09-06 |
| q4 | search:emergency dentist Osaka | AI/search visibility scout — canonical query | 2026-09-06 |
| q5 | search:Osaka dental clinic for expats | AI/search visibility scout — canonical query | 2026-09-06 |
| giq1 | search:ＤＵＯ大阪歯科医院 大阪 DUO Osaka Dental Clinic Nakanoshima | own domain duo-dental.com takes the top 2 results plus 3 more dedicated pages (homepage, fee schedule, case study) behind only one directory listing; two unrelated results (diploma-mill spam pages) fill the bottom of the page | 2026-09-07 |
| duo-osaka-dental-clinic-nakanoshima-osaka-presence | https://caloo.jp/hospitals/detail/4270004608 | Caloo page for Ushikubo Dental DUO Dental Clinic (Medical Corporation Seiwakai), Nakanoshima Mitsui Building 1F, 3-3-3 Nakanoshima, Kita-ku, Osaka, phone 06-6136-6480, read 2026-10-02: the public-register entry with no review (0 reviews) | 2026-10-02 |
| duo-osaka-dental-clinic-nakanoshima-osaka-presence-2 | https://haisha-yoyaku.jp/bun2sdental/list/?text=DUO%E5%A4%A7%E9%98%… | EPARK Dental's own search for the clinic's Japanese name, 2026-10-02: no clinic by that name or by "DUO Osaka" (0 results) | 2026-10-02 |
| duo-osaka-dental-clinic-nakanoshima-osaka-presence-3 | https://www.whatclinic.com/dentists/japan/osaka | WhatClinic catalog of dentists in Osaka read page by page on 2026-10-02 (3 listings on 1 page) and checked against the WhatClinic sitemap (3 Osaka profiles), addresses compared: no profile of the clinic; direct profile addresses for its name (duo-osaka-dental-clinic, duo-dental-clinic) return 404 | 2026-10-02 |
| duo-osaka-dental-clinic-nakanoshima-osaka-presence-4 | https://www.facebook.com/profile.php?id=100054590282671 | Facebook page "DUO specialists dental clinic" (680 followers), read 2026-10-02; newest post 2022-07-03; 90% recommend (8 reviews); address 3-3-3 Nakanoshima, Osaka; phone +81 6-6136-6480; website duo-dental.com, the clinic's own site | 2026-10-02 |
| duo-osaka-dental-clinic-nakanoshima-osaka-deepen | https://www.google.com/maps?cid=3787997036765033909&hl=en | Google listing (Dental clinic), read 2026-10-05 in undefined review orders (newest, lowest-rated, highest-rated, most relevant, most relevant in ja first): 4.5 from 105 reviews (1★ 10 / 2★ 3 / 3★ 2 / 4★ 2 / 5★ 88); 17 distinct reviews read, dated 2020-10-01 to 2026-09-29 | 2026-10-05 |
Change History
| Date | Change |
|---|---|
| 2026-10-05 | Read 17 of the clinic's Google reviews on 2026-10-05: no owner replies seen. |
| 2026-10-02 | Facebook presence re-checked on 2026-10-02: the clinic's Facebook page is inactive. |
| 2026-10-02 | Presence re-checked: presence on other review platforms — no. |
| 2026-09-29 | Corrected 2026-09-29: clinic responds to reviews now unverified: only 3 reviews were checked for owner replies. |
| 2026-09-06 | Checked by hand in a browser: the Google Maps place page was opened in a real browser and read for rating, review count, star histogram, review recency, owner replies, complaint and manipulation reading, listing website, phone, address and pin coordinates; the checks that needed a rendering browser were worked through on the clinic's own channels. |
| 2026-09-04 | Adversarial verification pass 2026-09-04: geo added from the MHLW Iryo Joho Net open data (snapshot 2025-12-01, facility ID 2733270072220); every line of the published fee table re-read and confirmed; the Kinki Regional Bureau of Health and Welfare entry 3141 (institution code 41-07499, designated Heisei 25.10.1 = 2013-10-01) reproduced exactly; both dentist searches re-run live; the clinic-published name forms DUO Osaka Shika Iin (the Japanese name) / DUO Osaka Dental Clinic confirmed on the clinic's own pages. |
| 2026-09-04 | Initial data collection for the Japan Dental Transparency & Trust Index: verified against the clinic's own Japanese and English sites and fee table, the Kinki Regional Bureau of Health and Welfare health-insurance designation list, the MHLW Iryo Joho Net facility register and the MHLW dentist qualification search. |
A question or a correction?
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