SMS vs Postcard: Testing Which Recall Method Actually Brings Dental Patients Back for Their Check-Up

10 October 2026·5 min read

Quick answer: There's no universal winner between SMS and postcards for dental recall — it genuinely depends on your patient list. The fix is a simple split test: send half your overdue patients an SMS and half a postcard, then track who actually rebooks within 30 days. Run it for one full recall cycle, look at your own numbers, and build your permanent recall mix around that — not around what worked for someone else's practice. 📱

I'll say the thing most dental marketing advice won't: nobody can tell you upfront whether SMS or postcards will bring more of your overdue patients back into the chair, because it depends on your patient base, your software, and how overdue people actually are 💖. What I can tell you is exactly how to find out, properly, in one recall cycle — instead of guessing, or running two expensive campaigns forever out of habit.

What most clinics get wrong

Most practices pick one recall channel, usually email because it's free, and stick with it indefinitely. Recall emails for a six-month check-up often go straight into a mental "later" pile, especially once a patient is genuinely overdue and has half-forgotten the reminder exists. When practices do branch out, they tend to switch the entire list to SMS, or the entire list to postcards, based on a hunch — rather than testing both on the same overdue segment and letting actual rebooking numbers decide.

A simple recall split test you can run this month:

Pull every patient overdue for a check-up by more than 30 days from your practice management software.
Split that list roughly 50/50 — alternating by patient ID is fine, you don't need fancy randomisation.
Send Group A an SMS: short, friendly, with a direct booking link or a phone number to call.
Send Group B a postcard: a clear headline, the practice name and number, and one obvious next step.
Tag every new booking by which recall channel brought the patient in, and track both groups for 30 days.
Run it again on the next overdue batch before you decide for good — one cycle can be skewed by a public holiday, a mail delay, or a single bad SMS send time.

The patient who's six months overdue and ignores every email: this is the group most practices lose quietly. They've had two or three email reminders land in a crowded inbox and done nothing with them. An SMS cuts through because it sits in the same thread as texts from people they actually know, and a one-tap booking link removes the excuse of "I'll do it later, when I'm at a computer."

The older patient who responds better to a physical reminder: plenty of long-standing patients still prefer paper. A postcard sitting on the kitchen bench or stuck to the fridge can outperform a text that gets glanced at and swiped away, particularly for patients who aren't big texters or who associate SMS with spam.

The younger patient who only acts on SMS: for patients in their twenties and thirties, a postcard is more likely to be recycled unopened than read. A text with a booking link that opens straight into your online scheduler meets them where they already are, and often gets a same-day response.

How to run the test without overcomplicating it

Keep the message content as close to equivalent as you can across both channels, so you're testing the channel, not the wording. Use a distinct phone number extension, a unique short link, or a simple tag in your practice software so every rebooking traces back to SMS or postcard — without that step, the test tells you nothing. Send both on the same day, since a gap between batches lets seasonal factors muddy the comparison. And resist calling the result after a handful of bookings; dental recall cycles are slow, so give each batch the full 30 days.

Please note: general information, not medical or clinical advice — check current AHPRA and professional body guidance before relying on it.

💡 The channel that wins for patients overdue by 30 days might lose for patients overdue by 12 months. Segment your test by how overdue someone is, not just by age or assumed channel preference — a patient who's badly lapsed often needs a different nudge (and sometimes a phone call) regardless of which channel first gets their attention.

Don't test with your whole list at once — a clean 50/50 split on one overdue segment gives you a result you can trust.
Don't change the offer or wording between channels; keep the message equivalent so you're only testing delivery method.
Don't call it after one short burst of bookings — dental recall takes weeks to play out, not days.
Don't forget to tag the booking source — without tracking, you'll have two campaigns and no answer.

Frequently asked questions

Which channel is cheaper to run?

SMS is almost always cheaper per message than printing and posting a postcard, but cost per send isn't the number that matters — cost per rebooking is. A slightly pricier channel that brings back more overdue patients can still be the better investment.

Can we just use both channels for everyone?

You can, and plenty of practices land there eventually, but it's worth testing first so you know whether you're paying for two channels because both genuinely add bookings, or because nobody's ever checked.

Does this work for short-notice reminders too, not just overdue recall?

Not really the same test. Short-notice appointment reminders (24–48 hours out) are a different problem with their own best practice — SMS tends to dominate there simply because of speed, regardless of what wins your longer recall test.

What if the test is basically a tie?

That's a genuinely useful result, not a failed test — it usually means your patient base is mixed enough that running both channels permanently, split by what you learned about who responds to what, is the right call rather than picking one and dropping the other.

Keep reading 🤍

Written by

Kate, founder of Chronically Online

I help Gold Coast and Brisbane businesses grow with branding, websites and marketing that actually works.

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