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Invisalign vs Six Month Smiles

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

Prices verified Sep 30, 2026FDA records verified Sep 30, 2026
81comparisons with Invisalign
22comparisons with Six Month Smiles

Invisalign (Invisalign clear aligners)·Six Month Smiles (6MS Invisible Aligners, 6MS Relapse Aligners, 6MS Mixed Appliance)

Invisalign
In-office
Six Month Smiles
In-office
At a glance
Starting price
$1,800-8,000provider-set
Provider-setnot published

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: Invisalign $1,800-8,000 (provider-set) and Six Month Smiles Provider-set.
  • Typical treatment differs: Invisalign 12-18 months and Six Month Smiles 6-10 months.
Go deeper

Open the full record

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

Every comparison with these brands

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

All 81 comparisons with Invisalign

  • vs 2USmiles
  • vs 32Co
  • vs Aalto
  • vs Active Aligners
  • vs Aligner32
  • vs AlignerCo
  • vs Aligneurs Français
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 Data is aggregated from public sources and each brand's own terms and can be incomplete or out of date.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.
InvisibleBracesInvisibleBraces

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
12-18 months
6-10 months
Supervision
In-office
In-office
FDA safety
No recalls
No recalls
FDA adverse-event reports
876
0
Treatment
Treats
CrowdingSpacing and gapsOverbiteUnderbite
CrowdingSpacing and gapsCrossbiteOpen biteDeep biteRelapse after bracesMild to moderate misalignment
Product lines
Invisalign clear aligners
6MS Invisible Aligners, 6MS Relapse Aligners, 6MS Mixed Appliance
Wear schedule
20 to 22 hrs/day, trays typically changed about weekly
Trays changed every 2 weeks; wear hours not published
Spec sheet
Start method
In-office iTero 3D digital scan (or impressions) taken at a dentist or orthodontist, who submits a computer-simulated treatment plan
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.
Material
SmartTrack (Align): a highly elastic multilayer thermoplastic developed after testing 260+ polymers, delivering gentler, more constant force
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.
Retainers
Vivera retainers, custom-made and sold in sets of four, commonly $400 to $1,200; nightly wear recommended long-term to prevent relapse
Not included in the patient tray kit; the dentist orders removable retainers from 6MS after treatment and sets their price
Whitening
Not a built-in feature; whitening is done separately by the provider if desired
Not published
Refinements / touch-ups
Additional aligner sets (refinements) to fine-tune results, typically included within comprehensive plans; exact allowance is provider-dependent
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.
Guarantee
Not published (no manufacturer money-back guarantee; any guarantee is provider-dependent)
No patient guarantee in the current terms: a limited warranty to the dentist covers defects in material and workmanship, not the outcome
Clinical oversight
Dentist or orthodontist directed, with in-person checkups throughout treatment
In-office: a trained dentist examines, prescribes, fits and monitors; 6MS specialists prepare the plan, overseen by its orthodontists, and the dentist approves it
Financing
Through the provider: many practices offer monthly payment plans; terms vary by office
Set by each practice
HSA / FSA
Eligible for HSA and FSA reimbursement as orthodontic care
The brand's cost page says HSA or FSA accounts can help offset the cost; acceptance is the practice's decision
Insurance
Often partially covered by dental or orthodontic benefits, with many plans applying a lifetime orthodontic maximum (commonly up to about $3,000)
Some dental plans may cover part of treatment (brand's cost page)
Availability
US and 100+ countries, delivered through trained dentists and orthodontists: Invisalign's own region picker lists 122 countries and territories, from Canada and Brazil to the UK, Australia, Japan and India (checked 2026-10-10)
United States and United Kingdom through trained dentists (the company says its providers are in over 50 countries, without separating braces from aligners)
Headquarters
Tempe, Arizona, USA
Carrollton, Texas, United States
Spec sources
  1. 1.realdentalcosts.com
  2. 2.dentalroundup.com
  3. 3.myglowupdentistry.com
  4. 4.investor.aligntech.com
  5. 5.invisalign.com.au
  1. 1.6monthsmiles.com
  2. 2.6monthsmiles.com
  3. 3.6monthsmiles.com
  4. 4.6monthsmiles.com
  5. 5.6monthsmiles.com
  6. 6.6monthsmiles.com
Company
On the market since
1998
2019
Parent company
Align Technology, Inc. (Nasdaq: ALGN), maker of the Invisalign system and iTero scanners
Xplora USA LLC, doing business as Six Month Smiles, Carrollton, Texas, United States
  • FDA safety
  • Specs
  • Sources
  • Where to get it
  • vs Aligno
  • vs Alineadent
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  • vs Caspersmile
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  • vs ClearCorrect
  • vs ClearPath
  • vs Dandy Clear Aligners
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  • vs Flash Aligners
  • vs Glidewell Clear Aligners
  • vs Glimmer Aligners
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  • vs hanaravi
  • vs i-liner
  • vs Illusion Aligners
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  • vs K Clear
  • vs KeepSmiling
  • vs Kirei Line
  • vs LetSmile
  • vs Linea
  • vs LINEO
  • vs Lulusmiles
  • vs makeO toothsi
  • vs Modern Clear
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  • vs Oh my teeth
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  • vs Orthocaps
  • vs Orthoclear
  • vs OrthoFX
  • vs OrthoSnap
  • vs Rata
  • vs Rejove32
  • vs Six Month Smiles (this page)
  • vs Smartee
  • vs SmartSmileCo
  • vs Smile Academy
  • vs Smile Aligners
  • vs Smile Perfect
  • vs Smileie
  • vs Smilekaro
  • vs Smilelign
  • vs Smileneo
  • vs SmilePath
  • vs Smilers
  • vs Smiles Club
  • vs SmileSet
  • vs smileunion
  • vs SmileWhite
  • vs Snazzy Aligners
  • vs SouSmile
  • vs SOV
  • vs Spark
  • vs Straight Teeth Direct
  • vs SureSmile
  • vs Toothfairy
  • vs uLab
  • vs Whistle
  • vs Wizz
  • vs Zenyum
  • All 22 comparisons with Six Month Smiles

    • vs 32Co
    • vs Alineadent
    • vs Angel Aligner
    • vs Clarity Aligners
    • vs ClearCorrect
    • vs ClearPath
    • vs Dandy Clear Aligners
    • vs Glidewell Clear Aligners
    • vs Graphy
    • vs Invisalign (this page)
    • vs K Clear
    • vs Motto
    • vs Nuvola
    • vs Orthocaps
    • vs OrthoFX
    • vs OrthoSnap
    • vs Smartee
    • vs Smilelign
    • vs Smilers
    • vs Spark
    • vs SureSmile
    • vs uLab
  • 7.6monthsmiles.com
  • 8.6monthsmiles.com
  • 9.6monthsmiles.com
  • 10.6monthsmiles.com
  • 11.api.fda.gov