Head to head

Caspersmile vs Straight Teeth Direct

Starting price, treatment length, supervision, FDA safety record and full spec sheet for Caspersmile and Straight Teeth Direct, side by side. Every figure links to the source that states it.

Prices checked against their sources Nov 11, 2026FDA records read Nov 10, 2026
9comparisons with Caspersmile
12comparisons with Straight Teeth Direct

Caspersmile (Caspersmile Aligners)·Straight Teeth Direct (StraightBox)

Caspersmile
Remote
Straight Teeth Direct
Dentist-led
At a glance
Starting price
£599
£1,790
Typical treatment
3-5 months
5-9 months
Supervision
Remote
Dentist-led
FDA safety
No recalls
No recalls
FDA adverse-event reports
0
0
Treatment
Treats
Mild-to-moderate crowdingSpacing and gaps
Mild-to-moderate crowdingSpacing and gaps
Product lines
Caspersmile Aligners
StraightBox
Wear schedule
All-day (~22 hrs)
All-day (~22 hrs)
Spec sheet
Start method
At-home impression kit (~GBP 27, regular ~GBP 95) or scan-center visit
At-home impression kit (~GBP 69) or in-person London scan (~GBP 79)
Material
BPA-free clear plastic
Clear plastic
Retainers
Retainers included
First set of retainers included
Whitening
Free whitening included
Not the headline inclusion (kit centres on aligners + app tracking)
Refinements / touch-ups
Not prominently published
App-supported smile-guarantee style support
Guarantee
Formal money-back terms not prominently published
Smile-guarantee style support via the app; first retainers included
Clinical oversight
Treatment overseen by UK-licensed dentists; starts with an impression kit or scan-center visit, then a 3D preview
Remote teledentistry via the Straight Teeth Direct app (dentist-led)
Financing
Monthly options
In-house plans with no credit check: three instalments of GBP 629, or GBP 499 upfront then GBP 179/month for 8 months; Humm finance on GBP 1,890 over 12, 24 or 36 months from about GBP 60.31/month (9.9% interest)
HSA / FSA
N/A (UK)
N/A (UK/EU)
Insurance
Not published
Not published
Availability
United Kingdom
United Kingdom, Europe
Headquarters
United Kingdom
United Kingdom / Europe
Spec sources
  1. 1.caspersmile.uk
  2. 2.caspersmile.uk
  1. 1.straightteethdirect.com
  2. 2.finance.straightteethdirect.com
  3. 3.newmouth.com
Company
On the market since
2020
2017
Parent company
Caspersmile (United Kingdom)
Straight Teeth Direct (United Kingdom / Europe)

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.

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Caspersmile
Straight Teeth Direct
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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.