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Head to head

Six Month Smiles vs Spark

Starting price, treatment length, supervision, FDA safety record and full spec sheet for Six Month Smiles and Spark, side by side. Every figure links to the source that states it.

Prices verified Sep 30, 2026FDA records verified Sep 30, 2026
22comparisons with Six Month Smiles
22comparisons with Spark

Six Month Smiles (6MS Invisible Aligners, 6MS Relapse Aligners, 6MS Mixed Appliance)ยทSpark (Spark clear aligners)

Six Month Smiles
In-office
Spark
In-office
At a glance
Starting price
Provider-setnot published
$3,500-8,000provider-set

Blue marks the lower price only where every compared price is quoted the same way (a monthly price in US dollars); prices quoted in another currency, as a one-time fee or as a provider-set range are shown exactly as stated and never converted. Adverse-event figures are raw counts of reports filed with the FDA, not rates (what the reports mean). Each spec value opens that brand's spec sheet, and its numbered sources verify the specs as a set. None of this is a recommendation: the right choice depends on your case, your budget and, above all, an in-person exam by a dentist or orthodontist.

The bottom line

What actually differs

  • Neither is marked lower, since only monthly prices quoted in US dollars are ranked against each other: Six Month Smiles Provider-set and Spark $3,500-8,000 (provider-set).
  • Typical treatment differs: Six Month Smiles 6-10 months and Spark 6-18 months.
Go deeper

Open the full record

Six Month Smiles
  • Prices
  • Treatment length
  • Supervision
  • FDA safety
  • Specs
  • Sources
  • Where to get it
Spark
  • Prices
  • Treatment length
  • Supervision
Keep comparing

Every comparison with these brands

Each brand against every other brand on the market. All comparisons

All 22 comparisons with Six Month Smiles

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InvisibleBraces is an informational data platform, not a dentist, an orthodontist, or a seller of aligners. Nothing here is dental or medical advice, a diagnosis, or a recommendation to start, stop, or change any treatment. At-home clear aligners are not right for every case, and moving teeth without an in-person exam carries real risk. Data is aggregated from public sources and each brand's own terms and can be incomplete or out of date. Always consult a licensed dentist or orthodontist and confirm current prices and terms with the provider.
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The independent, fully-cited comparison of at-home clear aligner brands. Every figure traces to its source. Informational only, not dental or medical advice.

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Typical treatment
6-10 months
6-18 months
Supervision
In-office
In-office
FDA safety
No recalls
No recalls
FDA adverse-event reports
0
36
Treatment
Treats
CrowdingSpacing and gapsCrossbiteOpen biteDeep biteRelapse after bracesMild to moderate misalignment
CrowdingSpacing and gapsOverbiteUnderbite
Product lines
6MS Invisible Aligners, 6MS Relapse Aligners, 6MS Mixed Appliance
Spark clear aligners
Wear schedule
Trays changed every 2 weeks; wear hours not published
20 to 22 hrs/day, trays changed roughly every 7 to 14 days per the treatment plan
Spec sheet
Start method
Taken by the dentist in the practice: an intraoral scan (3Shape, iTero, Cerec or STL files accepted) or PVS impressions, with x-rays and photos; there is no at-home kit.
In-office consultation with a licensed dentist or orthodontist, including x-rays and a 3D intraoral digital scan; the provider designs the plan and fits the aligners
Material
Zendura FLX, a dual-shell material (hard outer shell, elastomeric middle layer), 0.76 mm (0.030 in), per 6MS; the FDA summary describes a thermoformed polyurethane-polyester composite.
TruGEN and TruGEN XR (Ormco), a 0.75mm polymer free of BPA, latex, phthalates, and mercury; marketed as clearer, more stain-resistant, and better contoured to the tooth than the leading brand
Retainers
Not included in the patient tray kit; the dentist orders removable retainers from 6MS after treatment and sets their price
Spark Retainers (launched 2025) available through the provider; retainers required after treatment to prevent relapse (provider-set cost)
Whitening
Not published
Not published as a bundled consumer offering; whitening is at the provider's discretion (the TruGEN material is marketed as stain-resistant)
Refinements / touch-ups
Up to 2 refinements within 2 years are included in the 6MS Invisible Aligners product (aligner page); a no-charge upgrade to a braces solution is offered to the dentist if braces would produce a better outcome.
Provider-managed additional trays; TruGEN and TruGEN XR are available for both primary and refinement stages. Refinement policy and cost are set by the treating provider (not published as a fixed manufacturer allowance)
Guarantee
No patient guarantee in the current terms: a limited warranty to the dentist covers defects in material and workmanship, not the outcome
No manufacturer-level consumer guarantee; any satisfaction or results guarantee is set by the individual provider
Clinical oversight
In-office: a trained dentist examines, prescribes, fits and monitors; 6MS specialists prepare the plan, overseen by its orthodontists, and the dentist approves it
Doctor-directed with in-person progress visits about every 4 to 8 weeks (some providers add remote monitoring between visits)
Financing
Set by each practice
Provider-set in-office payment plans (review examples cite roughly $125 to $167/month depending on term); no brand-run financing program
HSA / FSA
The brand's cost page says HSA or FSA accounts can help offset the cost; acceptance is the practice's decision
Generally HSA/FSA eligible as orthodontic treatment (confirmed accepted per NewMouth review); depends on the provider and plan
Insurance
Some dental plans may cover part of treatment (brand's cost page)
Often covered under orthodontic benefits, though some dental plans treat adult aligners as cosmetic; coverage varies by plan and provider
Availability
United States and United Kingdom through trained dentists (the company says its providers are in over 50 countries, without separating braces from aligners)
Available in the U.S., Canada, Australia, New Zealand, Europe and China through Ormco-authorized dentists and orthodontists, piloted in Australia and New Zealand from 2017 (Spark's Australian FAQ, read 2026-10-10); US release December 2020. Its South Africa page names a network of orthodontists offering Spark there (archived 2026-07-11, read 2026-10-18)
Headquarters
Carrollton, Texas, United States
Brea, California, USA
Spec sources
  1. 1.6monthsmiles.com
  2. 2.6monthsmiles.com
  3. 3.6monthsmiles.com
  4. 4.6monthsmiles.com
  5. 5.6monthsmiles.com
  6. 6.6monthsmiles.com
  7. 7.6monthsmiles.com
  8. 8.6monthsmiles.com
  9. 9.6monthsmiles.com
  10. 10.6monthsmiles.com
  11. 11.api.fda.gov
  1. 1.newmouth.com
  2. 2.ormco.com
  3. 3.ormco.com
  4. 4.ormco.com
  5. 5.sparkaligners.com
  6. 6.web.archive.org
Company
On the market since
2019
2019
Parent company
Xplora USA LLC, doing business as Six Month Smiles, Carrollton, Texas, United States
Ormco Corporation, part of Envista Holdings (Nasdaq: NVST)
  • FDA safety
  • Specs
  • Sources
  • Where to get it
  • vs Glidewell Clear Aligners
  • vs Graphy
  • vs Invisalign
  • vs K Clear
  • vs Motto
  • vs Nuvola
  • vs Orthocaps
  • vs OrthoFX
  • vs OrthoSnap
  • vs Smartee
  • vs Smilelign
  • vs Smilers
  • vs Spark (this page)
  • vs SureSmile
  • vs uLab

    • All 22 comparisons with Spark

    • vs Active Aligners
    • vs Alineadent
    • vs Angel Aligner
    • vs Clarity Aligners
    • vs ClearCorrect
    • vs ClearPath
    • vs Dandy Clear Aligners
    • vs Glidewell Clear Aligners
    • vs Graphy
    • vs Invisalign
    • vs K Clear
    • vs KeepSmiling
    • vs Motto
    • vs Orthocaps
    • vs OrthoFX
    • vs OrthoSnap
    • vs Six Month Smiles (this page)
    • vs Smartee
    • vs Smile Academy
    • vs Smilers
    • vs SureSmile
    • vs uLab
  • 7.web.archive.org