さくらプラチナム歯科 (Sakura Platinum Dental Clinic)
According to our open methodology, this clinic scored 75/100 for transparency, reputation, service accessibility, and digital visibility.
Overall rank: #5 of 21 ranked clinics · Last checked: 6 September 2026
Positions by Rating Profile
- Overall Transparency & Trust#575/100
- Best for Expats#475.3/100
- Best for Dental Implantsnot ranked
- Best for Emergency Dental Care#374.2/100
- Best Price Transparency#282.4/100
- Best English-speaking Clinics#477/100
- Best for Families / Childrennot ranked
- 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
Late-hours Shibuya clinic aimed at walk-in and travelling patients: it is open every day of the year including public holidays, from midday until the early hours, one minute from Shibuya Station. It runs a fully English mirror site with an itemised private-care tariff — a flat JPY 33,000 standard treatment fee that includes the first examination and X-rays, plus per-item prices for fillings, crowns, extractions, pulp removal, bridges, mouthguards, whitening and cleaning — and requires a JPY 11,000 refundable deposit to confirm a booking. Booking and communication for non-Japanese speakers run through WhatsApp, LINE or a form, with translation-app support. The English site names only the director; the register records a different managing dentist.
Strengths
- Information Transparency: 20 of 20 points.
- Price Transparency: 13 of 15 points.
- Communication & Service: 8.5 of 10 points.
- No red flags identified in public sources.
Weaknesses
- AI & Search Visibility: 2.5 of 10 verifiable points (missing: mentioned for: best dentist Japan; mentioned for: English speaking dentist Japan; mentioned for: dental implants Japan; mentioned for: Japan dental clinic for expats; structured data on website; google indexing quality)
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 Director 田島 義久 (Yoshihisa Tajima) is named and profiled on the clinic's own English site; no other treating dentist is named there. [s3] | 3/3 |
| ✓ | Dentist specializations listed Director's profile lists membership of the Japanese Society of Esthetic Dentistry, the Japanese Society of Oral Implantology and the Japan Society for Laser Dentistry; no board specialty is claimed. [s3] | 2/2 |
| ✓ | Real clinic photos [s4] | 2/2 |
| ✓ | Service list published General dentistry, cosmetic dentistry, in-office whitening, cleaning and late-night emergency care, each with its own page. [s2] | 3/3 |
| ✓ | Clear contact details [s4] | 2/2 |
| ✓ | English website version Complete English mirror of the site. [s1] | 2/2 |
| ✓ | Address and map published [s4] | 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 English-language tariff: standard treatment fee JPY 33,000 plus itemised additional services, worked cost examples and a deposit policy. [s5] | 3/3 |
| ✓ | Cleaning price listed Cleaning and fluoride therapy JPY 33,000; cleaning plus in-office whitening JPY 66,000. [s5] | 2/2 |
| ✓ | Filling price listed Composite fillings from JPY 22,000; caries treatment from JPY 11,000. [s5] | 2/2 |
| ✓ | Crown price listed Dental crown from JPY 55,000; temporary crown from JPY 11,000; recementation from JPY 11,000. [s5] | 2/2 |
| ✗ | Implant price listed Implants are not among the services or fees the clinic publishes. [s2] [s5] | 0/2 |
| ✓ | Consultation price listed The JPY 33,000 standard fee is stated to be the minimum charge for the first visit and to include the initial examination. [s5] | 2/2 |
| ✓ | X-ray / imaging price listed Not priced separately: the JPY 33,000 standard first-visit fee is stated to include examination and X-rays. [s5] | 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: 99 five-star, 26 four-star, 6 three-star, 1 two-star, 28 one-star. The buckets sum to 160, matching the 160 in the place-page header exactly, and the weighted mean 4.044 reproduces the published 4. [gmp1] | 3/6 |
| ◐ | 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 2 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. The Newest sort does not open to the extension (re-tested on this run by opening the Reviews tab and scrolling the panel, which returned the same three reviews), so no fresher slice is available. [gmp1] | 3/3 |
| ✓ | Clinic responds to reviews The owner replied to all three reviews Google renders. Sample: the 3 reviews Google Maps renders on the place page in its own relevance order. The Newest sort does not open to the extension (re-tested on this run by opening the Reviews tab and scrolling the panel, which returned the same three reviews), so no fresher slice is available. [gmp1] | 2/2 |
| ✓ | No recurring complaints None of the three reviews Google renders is critical - all three describe emergency and late-hours treatment of visitors. The histogram is the widest spread in the country, 99/26/6/1/28, and 29 of 160 ratings (18 per cent) are two-star or one-star; none of them is inside the visible sample, so this false rests on the sample rather than on the base. Sample: the 3 reviews Google Maps renders on the place page in its own relevance order. The Newest sort does not open to the extension (re-tested on this run by opening the Reviews tab and scrolling the panel, which returned the same three reviews), so no fresher slice is available. [gmp1] | 2/2 |
| ✓ | No suspicious review patterns An unusual shape - a large four-star bucket (26) alongside a large one-star bucket (28) - which is a divided base rather than a manipulation signature. Sample: the 3 reviews Google Maps renders on the place page in its own relevance order. The Newest sort does not open to the extension (re-tested on this run by opening the Reviews tab and scrolling the panel, which returned the same three reviews), so no fresher slice is available. [gmp1] | 2/2 |
| ? | Active Facebook presence | 0/1 |
| ? | TripAdvisor presence | 0/0.5 |
| ? | Other review platforms | 0/0.5 |
Medical Infrastructure
The range of publicly documented equipment and services. This measures documented availability, not clinical quality.
| ✓ | On-site X-ray X-rays included in the published first-visit fee. [s5] | 2/2 |
| ? | CBCT (3D imaging) | 0/2 |
| ✗ | Implantology Not offered on the clinic's published service list. [s2] | 0/2 |
| ✓ | Orthodontics Orthodontics (矯正歯科) is one of the clinic's declared 標榜診療科目 in the 関東信越厚生局 designation list; the clinic's own site describes general and cosmetic dentistry only. [reg4] | 2/2 |
| ✓ | Oral surgery Extractions including upper wisdom teeth; lower wisdom teeth are declined for same-day treatment because of nerve proximity. [s5] | 2/2 |
| ? | Pediatric dentistry | 0/1.5 |
| ✓ | Emergency care Late-night and same-day emergency treatment, open every day of the year. [s4] [s2] | 1.5/1.5 |
| ✓ | Works with international patients English-only booking and treatment track, translation-app support, private-care pricing for patients without Japanese health insurance. [s4] [s5] | 2/2 |
Communication & Service
How easy it is to contact the clinic, get answers, and book - especially for international patients.
| ✓ | WhatsApp / LINE available Booking and enquiries via WhatsApp or LINE. [s4] | 2/2 |
| ? | Response speed | 0/1.5 |
| ✓ | English spoken The clinic describes English communication supported by a translation app rather than by in-house fluency. [s4] | 2.5/2.5 |
| ✓ | Pre-visit consultation possible Booking and questions accepted in advance via WhatsApp, LINE or a form; treatment plan and fees explained after an in-person examination. [s4] | 1.5/1.5 |
| ✓ | Clear service explanations [s2] | 1/1 |
| ✓ | Convenient opening hours Open daily including public holidays, 12:00 until the early hours; one minute from Shibuya Station. [s4] | 1.5/1.5 |
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 [q1] | 0/1 |
| ✗ | Mentioned for: English speaking dentist Japan [q2] | 0/1 |
| ✗ | Mentioned for: dental implants Japan [q3] | 0/1 |
| ✓ | Mentioned for: emergency dentist Japan [q4] | 1/1 |
| ✗ | Mentioned for: Japan dental clinic for expats [q5] | 0/1 |
| ✗ | Structured data on website Two schema.org JSON-LD blocks, but only Organization, WebSite, WebPage, ImageObject and BreadcrumbList nodes; there is no Dentist, LocalBusiness or MedicalClinic markup, which is what this criterion asks for. [s1] | 0/1.5 |
| ✗ | Google indexing quality own domain (sakurashika24-3.com) appears only once, last among 8 results, behind X/Facebook/Instagram and four separate Japanese booking directories (WebSearch 2026-09-07) [giq1] | 0/2 |
| ✓ | Dedicated service pages [s2] | 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: 医療機関コード 13,8336,3 — designated 保険医療機関 (dental clinic), 指定年月日 平成29年3月1日 (2017-03-01), 標榜科目 歯科・矯正歯科・歯科口腔外科, per the 関東信越厚生局 Tokyo dental designation list as of 令和8年9月1日 (2026-09-01); founder 医療法人社団 星桜会 理事長 田島 義久, managing dentist 中村 浩彦. Also registered as 歯科診療所 in MHLW 医療情報ネット under facility code 3133100114, record last updated 2026/2/13. [reg1] [reg4]
Dentists & professional licences
| Dentist | Specialization | Licence No. |
|---|---|---|
| 田島 義久 (Yoshihisa Tajima) [s3] [reg3] [reg4] | Director; chairman of 医療法人社団星桜会; Nagasaki University Faculty of Dentistry | Registered 歯科医師 — MHLW 医師等資格確認検索, year of registration 平成14年 (2002). The register publishes no registration number. |
| 中村 浩彦 [reg1] [reg3] [reg4] | Managing dentist (管理者) of record for the Shibuya facility | Registered 歯科医師 — MHLW 医師等資格確認検索, year of registration 昭和62年 (1987) or 平成6年 (1994). The register publishes no registration number. |
Red Flags
No red flags identified in the public sources we reviewed.
Data We Could Not Verify
- Reputation & Reviews: Active Facebook presence
- Reputation & Reviews: TripAdvisor presence
- Reputation & Reviews: Other review platforms
- Medical Infrastructure: CBCT (3D imaging)
- Medical Infrastructure: Pediatric dentistry
- 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.sakurashika24-3.com/en/ |
|---|---|
| Phone | +81 3-6452-6588 |
| Google Maps | Map listing |
| Address | 〒150-0002 東京都渋谷区渋谷2-22-13 渋谷東口マイアミビル5階・6階 (5F-6F Miami Bldg., 2-22-13 Shibuya, Shibuya-ku, Tokyo 150-0002) |
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.sakurashika24-3.com/en/ | English site, clinic name, structured data | 2026-09-04 |
| s2 | https://www.sakuradentist.com/en/services-en | Published service list | 2026-09-04 |
| s3 | https://www.sakuradentist.com/en/director-en | Named director, education and society memberships | 2026-09-04 |
| s4 | https://www.sakuradentist.com/en/clinic-en | Address, opening hours, English and multilingual support, booking channels, premises photographs | 2026-09-04 |
| s5 | https://www.sakuradentist.com/en/fees-en | Itemised English-language fee list and deposit policy | 2026-09-04 |
| reg1 | https://www.iryou.teikyouseido.mhlw.go.jp/znk-web/juminkanja/S2430/… | MHLW 医療情報ネット (ナビイ) — the statutory facility register kept under 医療法第6条の3: official name 医療法人社団星桜会 さくらプラチナム歯科, operator, managing dentist 中村 浩彦, foreign-language support recorded, last updated 2026/2/13 | 2026-09-04 |
| reg3 | https://licenseif.mhlw.go.jp/search_isei/jsp/top.jsp | MHLW 医師等資格確認検索 (dentist register), snapshot 2026-09-04 | 2026-09-04 |
| reg4 | https://kouseikyoku.mhlw.go.jp/kantoshinetsu/chousa/shitei.html | 関東信越厚生局 Tokyo dental designation list as of 2026-09-01: 医療機関コード 13,8336,3, founder, managing dentist, declared specialties and 指定年月日 | 2026-09-04 |
| q1 | search:best dentist Tokyo | Canonical patient-visibility query, run 2026-09-04 | 2026-09-04 |
| q2 | search:English speaking dentist Tokyo | Canonical patient-visibility query, run 2026-09-04 | 2026-09-04 |
| q3 | search:dental implants Tokyo | Canonical patient-visibility query, run 2026-09-04 | 2026-09-04 |
| q4 | search:emergency dentist Tokyo | Canonical patient-visibility query, run 2026-09-04 | 2026-09-04 |
| q5 | search:Tokyo dental clinic for expats | Canonical patient-visibility query, run 2026-09-04 | 2026-09-04 |
| gmp1 | https://www.google.com/maps/place/Sakura+Platinum+Dental+Clinic+(Sh… | 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 |
| giq1 | search:さくらプラチナム歯科 渋谷 Sakura Platinum Dental Shibuya | own domain (sakurashika24-3.com) appears only once, last among 8 results, behind X/Facebook/Instagram and four separate Japanese booking directories | 2026-09-07 |
Change History
| Date | Change |
|---|---|
| 2026-09-06 | Combined browser pass (agent I-3, korea + japan): 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 country worklist rows 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 医療情報ネット open data (snapshot 2025-12-01, facility ID 1333133100114); the two clinic domains confirmed to be the same practice (sakurashika24-3.com/en canonicalises to sakuradentist.com/en); the whole English fee list re-read; the director searched in the dentist register and found; structured data reclassified; confirmed the site publishes neither implant services nor implant fees. |
| 2026-09-04 | Initial data collection for the Japan Dental Transparency & Trust Index: verified against the clinic's own English site and fee list, the 関東信越厚生局 health-insurance designation list, the MHLW 医療情報ネット facility register and the MHLW dentist qualification search. |
A question or a correction?
Have a question, a suggestion, or a correction to this page? Get in touch — we read every message. Verified data corrections are reviewed against sources and applied with a public change-history entry.
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