Most foot products sold to dancers open the same way: your feet are being destroyed, here is the fix. We are not going to do that, because the research does not support it. Dancers' feet are, by several measures, unusually strong. What they are is strong in one direction — and that is a more useful thing to know.
What years of training actually build
Researchers used MRI to compare individual plantar intrinsic muscles — the small muscles inside the sole of the foot — in ballet dancers and non-dancers. Across all three volume measures, only two came out consistently larger in dancers: the flexor digitorum brevis and the lumbricals, with large effect sizes.1
Both are specialised for flexing the toes. The authors attribute the difference to long-term repetitive loading during tiptoe standing. Put simply, your training built exactly the muscles your training uses.
Strength testing points the same way. In one comparison, collegiate female dancers produced toe flexor strength of 27.0 kg — 47.6% of body weight — against 14.5 kg and 27.8% in non-dancers.2 Nobody has reported dancers coming out lower.
What it doesn't build
Look at what those two muscles do and the gap becomes obvious. Every position you have ever held asks the toes to point, press or curl. None of them asks the toes to spread.
Drawing the big toe outward, away from the second, is a distinct movement with its own name — hallux abduction — and its own muscle, the abductor hallucis. It was not among the muscles found consistently larger in dancers. Fifteen years of class does not train a direction class never goes.
What the research says about training it
A 2015 trial split 24 people with hallux valgus into two groups for eight weeks. Both wore an orthosis. Only one group also performed a toe-spread-out exercise — actively pulling the big toe away from the second.3
The orthosis-only group showed no significant change in anything measured. The group that added the movement improved significantly in all three measures: a smaller hallux valgus angle, a smaller angle during active abduction, and a larger abductor hallucis muscle.
That study is why we describe Toe-Rx the way we do. Sitting with something between your toes did nothing over two months. The movement is what moved the numbers. Toe-Rx holds the toes open wide enough to work in, and gives them something to close against — but the ten minutes is a real ask, not a passive one.
What it doesn't do
A 2023 systematic review pooled 13 randomized trials of intrinsic foot muscle training, screening each for methodological quality first. Balance, strength, navicular drop and self-reported foot function all improved significantly. Pain did not.4
We would rather tell you that than have you buy something for a foot that hurts. Dancers are documented as reluctant to seek medical attention, which is exactly why this belongs here: pain in a dancer's foot is worth a clinician's time, not a product page's.
You will also see toe spacers sold on claims about preventing bunions, improving technique and extending careers. We have not found research supporting any of those, so we don't make them. A trial on toe flexor training and jumping in vocational ballet students is registered but had not reported when this was written — if it publishes and it goes against us, we will say so.
What happens inside the shoe is a separate question
Ten professional dancers were X-rayed on pointe wearing two different toe caps, in randomized order, with pain rated each time. The customised prototype produced significantly lower toe deviation angles and roughly half the pain score of the standard cap.5
We mention it because it makes a point worth making, and not the point you might expect. Conditions inside your pointe shoe measurably change how your toes sit and how much they hurt. That is a conversation with your fitter, not with us. Toe-Rx is worn on bare feet and goes nowhere near a pointe shoe.
How to use it
Toe-Rx has been made in Japan since 1988. A session takes five to ten minutes per foot, sitting down, on bare feet:
- Open. Work each toe fully into its slot and sit with them held apart. Let the foam do it.
- Circle. Use your hand to rotate the tips of your toes in small circles, ten each way.
- Grip. Lift your toes, then press them down into the floor, squeezing against the foam as they close. Fifteen to twenty repetitions. This is the working part.
Every other day is enough, and after class — once the shoes are off — is the easiest time to remember. Not in the hour before class: a foot you have just spread wide is not the foot your box was fitted around. Full instructions and photos are here.
Choosing a size and firmness
Toe-Rx is not one-size-fits-all. Three sizes — Small, Medium and Large — in two firmnesses, Soft and Firm. Wearing the wrong size is uncomfortable and can lead to injury.
Start from your everyday shoe size, not your pointe shoe size. Pointe shoes run on their own scale, vary by maker, and are fitted to a loaded foot in a box — none of which describes what this has to fit.
We suggest dancers start with Soft, and not because we think your feet are fragile. The strength data says otherwise. It is because a high tolerance for discomfort is an asset in the studio and a liability with an unfamiliar movement. Both types cost the same. If the pair you receive pinches or slips, get in touch and we will exchange it.
See all six options and the sizing guide
The longer version
This is the short account. We have written the full one up separately, with every figure sourced and every limit stated — including the studies that argue against us and the question of whether ballet causes bunions at all, which is far less settled than the marketing suggests.
Strong feet, in one direction — the research on dancers' feet
*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Nothing here is guidance on pointe readiness, which belongs to your teacher and a clinician who can see you dance.
References
- Fukuyama H, Maeo S, Kusagawa Y, Sugiyama T, Kanehisa H, Isaka T. Differences in the size of individual plantar intrinsic foot muscles between ballet dancers and non-dancers. Journal of Dance Medicine & Science. 2025;29(2):91–97. doi:10.1177/1089313X241273887. PMID: 39164843. Read it
A cross-sectional MRI comparison, not a trial. It found which muscles were larger — it did not test any intervention, and it does not say the other muscles are weak. - Foot arch height, toe flexor strength, and dynamic balance ability in collegiate female dancers and non-dancers. Read it
One university, female dancers only. The wider literature is split: some studies find no difference in toe flexor strength between dancers and non-dancers. - Kim MH, Yi CH, Weon JH, Cynn HS, Jung DY, Kwon OY. Effect of toe-spread-out exercise on hallux valgus angle and cross-sectional area of abductor hallucis muscle in subjects with hallux valgus. Journal of Physical Therapy Science. 2015;27(4):1019–1022. doi:10.1589/jpts.27.1019. PMID: 25995546. Read it
24 participants, none of them dancers, all with hallux valgus already established. Both groups wore an orthosis, so this shows what adding the exercise did — not what the exercise achieves alone. The orthosis used was not Toe-Rx. - Jaffri AH, Koldenhoven R, Saliba S, Hertel J. Evidence for intrinsic foot muscle training in improving foot function: a systematic review and meta-analysis. Journal of Athletic Training. 2023;58(11–12):941–951. doi:10.4085/1062-6050-0162.22. PMID: 35724360. Read it
13 trials pooled, in the general population rather than dancers. Pain was measured and did not significantly improve. - Salzano A, Camuso F, Sepe M, Sellami M, Ardigò LP, Padulo J. Acute effect of toe cap choice on toe deviation angle and perceived pain in female professional ballet dancers. BioMed Research International. 2019;2019:9515079. doi:10.1155/2019/9515079. PMID: 31093504. Read it
Ten dancers, crossover design, acute effects only. It compared two toe caps worn inside pointe shoes — not toe spacers, and nothing worn barefoot. Two of the authors supplied the customised prototype tested and hold a patent on it, which the paper discloses.
