Smile Signature Dental Clinics
According to our open methodology, this clinic scored 78.8/100 for transparency, reputation, service accessibility, and digital visibility.
Overall rank: #4 of 11 ranked clinics · Last checked: 25 August 2026
Positions by Rating Profile
- Overall Transparency & Trust#478.8/100
- Best for Expats#378.3/100
- Best for Dental Implants#475.5/100
- Best for Emergency Dental Carenot ranked
- Best Price Transparency#386.9/100
- Best English-speaking Clinics#379.2/100
- Best for Families / Childrennot ranked
- Sleep Dentistry (GA / deep sedation)#278.8/100
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) — General anaesthesia / deep sedation documented Own site states clinic partners with BIDH Dental Hospital to offer 'total sleep dentistry' for anxious patients. [s2]
Summary
Smile Signature is a Bangkok dental clinic group with five branches of its own (Ratchadapisek head office, Siam Square, Sukhumvit, Seacon Square and Ratchayothin) plus affiliated clinics, stating over 20 years of operation. It publishes a detailed fee schedule and a team page listing dentists with specializations and credentials. Services cover implants, orthodontics including Invisalign, cosmetic dentistry, root canals, oral surgery and general care, with a dedicated international patient services section in English and Chinese.
Ratchada branch states ISO 9001:2015 certification. A 100 THB sterilization charge applies per appointment. An independent expat review (thailandstarterkit.com) described a checkup that led to six fillings but explicitly concluded the treatment was justified and conservative, not upselling. Google rating recorded is for the Siam Square branch; other branches were not individually verified.
Strengths
- Information Transparency: 20 of 20 points.
- Price Transparency: 15 of 15 points.
- Reputation & Reviews: 17.5 of 20 points.
- Communication & Service: 8.5 of 10 points.
Weaknesses
- AI & Search Visibility: 3.5 of 8.5 verifiable points (missing: mentioned for: best dentist bangkok; mentioned for: english speaking dentist bangkok; mentioned for: dental implants bangkok; mentioned for: emergency dentist bangkok; mentioned for: bangkok dental clinic for expats)
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] [s2] | 4/4 |
| ✓ | Dentist names listed Individual dentists with names, photos and credentials, e.g. Dr. Chutima Kositpantavong (prosthodontist), Assist. Prof. Dr. Boworn Klongnoi (implantologist/OMFS) [s4] | 3/3 |
| ✓ | Dentist specializations listed Organized by specialty: prosthodontists, implantologists, orthodontists, endodontists, periodontists, oral & maxillofacial surgeons [s4] | 2/2 |
| ✓ | Real clinic photos Branch-specific clinic photos shown on site [s2] | 2/2 |
| ✓ | Service list published [s1] [s2] | 3/3 |
| ✓ | Clear contact details Phone, email, LINE and per-branch phone numbers published [s1] [s2] | 2/2 |
| ✓ | English website version [s2] | 2/2 |
| ✓ | Address and map published Branch addresses with BTS/MRT exit directions published; embedded map not directly verified [s1] [s2] | 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 Detailed fee page; site states fixed, standardized fees with no foreigner surcharge [s3] | 3/3 |
| ✓ | Cleaning price listed THB 1,200-1,800 per case (cleaning, scaling & polishing) [s3] | 2/2 |
| ✓ | Filling price listed THB 1,000 per surface (tooth-colored), +THB 100 per cavity for base/sub-base [s3] | 2/2 |
| ✓ | Crown price listed PFM THB 10,000-12,000; eMax THB 15,900-16,900 (promo); zirconia THB 17,000 [s3] | 2/2 |
| ✓ | Implant price listed Approx THB 35,000-85,000 depending on implant system, incl. post, abutment and crown (promotional pricing) [s3] | 2/2 |
| ✓ | Consultation price listed Checkup and consultation listed as free [s3] | 2/2 |
| ✓ | X-ray / imaging price listed THB 200 small digital film; THB 1,200 panoramic [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) as of 2026-08-25 (head-office Ratchada listing) [smile-signature-dental-clinic-refresh] | 6/6 |
| ✓ | Google review volume [smile-signature-dental-clinic-refresh] | 3/3 |
| ✓ | Review recency [smile-signature-dental-clinic-refresh] | 3/3 |
| ? | Clinic responds to reviews | 0/2 |
| ✓ | No recurring complaints One negative TripAdvisor forum post (deep cleaning done in one session, painful injection); independent review explicitly found no upselling; no recurring complaint theme observed [s6] [s9] | 2/2 |
| ✓ | No suspicious review patterns Ratings consistent across Google (via Wanderlog), WhatClinic and forum discussions incl. critical voices; no pattern observed [s5] [s8] [s9] | 2/2 |
| ✓ | Active Facebook presence [s7] | 1/1 |
| ? | TripAdvisor presence Forum discussions about the clinic exist on TripAdvisor; no business listing verified [s9] | 0/0.5 |
| ✓ | Other review platforms WhatClinic (33 reviews for Siam Square), Dental Departures, Bookimed, Wanderlog [s8] | 0.5/0.5 |
Medical Infrastructure
The range of publicly documented equipment and services. This measures documented availability, not clinical quality.
| ✓ | On-site X-ray Digital intraoral and panoramic x-ray priced on fee page [s3] | 2/2 |
| ? | CBCT (3D imaging) | 0/2 |
| ✓ | Implantology Single, multiple, full-jaw, All-on-4, one-day implants [s2] [s3] | 2/2 |
| ✓ | Orthodontics Invisalign, Damon, metal/ceramic and lingual braces [s2] | 2/2 |
| ✓ | Oral surgery Extractions, wisdom teeth removal; oral & maxillofacial surgeons on team [s2] [s4] | 2/2 |
| ? | Pediatric dentistry | 0/1.5 |
| ? | Emergency care | 0/1.5 |
| ✓ | Works with international patients Dedicated international patient services page; Thai, English, Chinese support [s2] | 2/2 |
Communication & Service
How easy it is to contact the clinic, get answers, and book - especially for non-Thai speakers.
| ✓ | WhatsApp / LINE available LINE @smilesignature [s2] | 2/2 |
| ? | Response speed | 0/1.5 |
| ✓ | English spoken English site; independent reviewer and aggregator reviews note fluent English staff [s2] [s6] | 2.5/2.5 |
| ✓ | Pre-visit consultation possible Checkup and consultation offered free of charge [s3] | 1.5/1.5 |
| ✓ | Clear service explanations Independent reviewer praised explanation of treatment options and conservative approach [s6] | 1/1 |
| ✓ | Convenient opening hours Siam Square: Mon-Sat 10:00-20:00, Sun 10:00-18:00 [s5] | 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 Bangkok", "English speaking dentist Bangkok", "dental implants Bangkok", "emergency dentist Bangkok", "Bangkok dental clinic for expats".
| ✗ | Mentioned for: best dentist Bangkok [s10] | 0/1 |
| ✗ | Mentioned for: English speaking dentist Bangkok [s11] | 0/1 |
| ✗ | Mentioned for: dental implants Bangkok [s12] | 0/1 |
| ✗ | Mentioned for: emergency dentist Bangkok [s13] | 0/1 |
| ✗ | Mentioned for: Bangkok dental clinic for expats [s14] | 0/1 |
| ? | Structured data on website Not determinable from markdown conversion of fetched pages | 0/1.5 |
| ✓ | Google indexing quality Own site (smilesignature.com/en/) ranks in top results for brand + reviews searches [s15] | 2/2 |
| ✓ | Dedicated service pages Separate service and fee pages per treatment (implants, veneers, Invisalign, whitening, crowns) [s2] [s3] | 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: not published on the clinic’s website — red flag applied [smile-signature-dental-clinic-lic] [s2]
Dentists & professional licences
| Dentist | Specialization | Licence No. |
|---|---|---|
| Dr. Chutima Kositpantavong [s4] | Prosthodontist | not verified |
| Dr. Chaisurat Takolpuckdee [s4] | Prosthodontist | not verified |
| Dr. Phisak Khositphanthawong [s4] | Prosthodontist | not verified |
| Dr. Yupamas Boonchawal [s4] | Prosthodontist | not verified |
| Dr. Korakot Jirapatsunthorn [s4] | Prosthodontist | not verified |
| Dr. Ploylada Vitavaspan [s4] | Prosthodontist | not verified |
| Asst. Prof. Dr. Boworn Klongnoi [s4] | Implantologist / Oral & Maxillofacial Surgeon | not verified |
| Assoc. Prof. Dr. Prakan Thanasrisuebwong [s4] | Implantologist / Oral & Maxillofacial Surgeon | not verified |
| Dr. Pranai Nakaparksin [s4] | Implantologist | not verified |
| Dr. Vishal Sehgal [s4] | Implantologist | not verified |
| Dr. Phenporn Luengchana [s4] | Implantologist | not verified |
| Dr. Nantreda Pongpanich [s4] | Implantologist | not verified |
| Dr. Ratirat Chotipanvidhayakul [s4] | Implantologist / Aesthetic Dentist | not verified |
| Dr. Worapat Jarangkul [s4] | Implantologist | not verified |
| Dr. Badin Suksamai [s4] | Implantologist | not verified |
Dentists are named; their licence numbers have not been checked against public sources yet — unverified, no penalty.
Red Flags
- medium Clinic operating licence not published (-4 pts) — The clinic does not publish its operating licence or registration number (derived from data).
Red-flag penalty applied: -4 points (capped at -20).
Data We Could Not Verify
- Reputation & Reviews: Clinic responds to reviews
- Reputation & Reviews: TripAdvisor presence
- Medical Infrastructure: CBCT (3D imaging)
- Medical Infrastructure: Pediatric dentistry
- Medical Infrastructure: Emergency care
- Communication & Service: Response speed
- AI & Search Visibility: Structured data on website
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://smilesignature.com/en/ |
|---|---|
| Phone | +66 2 693 6933 |
| LINE | @smilesignature |
| https://www.facebook.com/SmileSignature/ | |
| Google Maps | Map listing |
| Address | 257/26 Ratchadapisek Rd, The Wiz Ratchada (head office), Din Daeng, Bangkok |
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.smilesignature.com | Official Thai homepage: branch addresses/phones, LINE, services, ISO 9001:2015 mention, dentist listings by branch | 2026-07-03 |
| s2 | https://smilesignature.com/en/ | Official English homepage: contacts, LINE @smilesignature, services, international patient services, clinic photos, subpages | 2026-08-25 |
| s3 | https://smilesignature.com/en/fees/ | Published price list: cleaning, fillings, crowns, implants, x-ray, free consultation | 2026-07-03 |
| s4 | https://smilesignature.com/en/dentist/ | Dentist names, photos, specializations and credentials | 2026-07-03 |
| s5 | https://wanderlog.com/place/details/5350851/smile-signature-siam-sq… | Google Maps rating 4.8 with 683 reviews (Siam Square branch), address, phone, opening hours | 2026-07-03 |
| s6 | https://www.thailandstarterkit.com/health/smile-signature-review/ | Independent patient review (Seacon Square): prices paid, no upselling found, clear explanations, positive conclusion | 2026-07-03 |
| s7 | https://www.facebook.com/SmileSignature/ | Official Facebook page presence | 2026-07-03 |
| s8 | https://www.whatclinic.com/dentists/thailand/bangkok/smile-signatur… | Presence on WhatClinic with 33 reviews | 2026-07-03 |
| s9 | https://www.tripadvisor.com/ShowTopic-g293916-i3687-k9277790-Smile_… | TripAdvisor forum discussions: mostly positive long-term implant experience, one complaint about deep cleaning | 2026-07-03 |
| s10 | search:best dentist Bangkok | AI/search visibility check: absent from top results | 2026-07-03 |
| s11 | search:English speaking dentist Bangkok | AI/search visibility check: absent from top results | 2026-07-03 |
| s12 | search:dental implants Bangkok | AI/search visibility check: absent from top results | 2026-07-03 |
| s13 | search:emergency dentist Bangkok | AI/search visibility check: absent from top results | 2026-07-03 |
| s14 | search:Bangkok dental clinic for expats | AI/search visibility check: absent from top results | 2026-07-03 |
| s15 | search:Smile Signature dental clinic Bangkok reviews google rating | Own site ranks in top results for brand searches (indexing quality) | 2026-07-03 |
| smile-signature-dental-clinic-refresh | https://www.google.com/maps/place/Smile+Signature+Ratchada+Dental+%… | most recent visible review ~2 months before check (~Jun 2026) | 2026-08-25 |
| smile-signature-dental-clinic-lic | https://hosp.hss.moph.go.th/ | searched: ซิกเนเจอร์ / สมายล์ซิกเนเจอร์ — each returned 'ไม่พบข้อมูล' (no data found) | 2026-08-25 |
Change History
| Date | Change |
|---|---|
| 2026-08-25 | License verification 2026-08-25: searched the MOPH private healthcare facility registry with 2 name variants (Signature / Smile Signature) — no match for either, though the same Thai phrase appears in the clinic's own Google Maps title; the clinic's own website also publishes no license number. clinicLicense marked verified-false per methodology v1.3.0. |
| 2026-08-25 | Recorded sedation / general anaesthesia availability (informational): documented as available. Own site states clinic partners with BIDH Dental Hospital to offer 'total sleep dentistry' for anxious patients. |
| 2026-08-25 | Re-verification 2026-08-25: confirmed website/address unchanged; phone verified today as +66 2 693 6933 via both the site and Maps (stored +66 91 002 2288 was not found on either source and appears outdated). Google rating jumped to 5.0 (2,826 reviews) from 4.8/683 on the head-office Ratchada listing. Clinic's own site confirms 'total sleep dentistry' via partner BIDH. Captured Maps URL and geo. |
| 2026-07-08 | Added Licensing & Credentials (methodology v1.1): clinic licence and dentists/their licence numbers. |
| 2026-07-03 | Initial data collection. |
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.