SMS vs email vs phone for dental recall — which channel wins (spoiler: it's the wrong question)
Single-channel comparisons systematically underestimate the compounding effect. Here's the real data.
The single-channel reality
SMS only: 95-98% delivered. 98% opened (SMS is phone-native). 15-22% reply rate. 3-7% book rate per send. Cost: $0.01-0.03 per send (Twilio 10DLC).
Email only: 94-97% delivered. 55-65% open rate. 5-9% reply rate. 3-5% book rate per send. Cost: essentially free.
Phone only: 30-45% answer rate. Of answered calls: 55% have real conversations, 25-35% book. Overall: 12-18% book rate on calls that connect. Cost: 2-4 minutes of front-desk time per call.
Postcard: 85-92% delivered. 3-6% response. Cost: $1.50-3 per mailing.
Picking the 'best' channel: SMS wins on speed + cost, phone wins on book rate per contact, postcard wins for very long-lapsed (18+ months) where digital has burned out.
The multi-channel reality (the real answer)
A 5-touch sequence across email + SMS + phone over 14 days produces a 25-35% reactivation rate. The same 5 touches via SMS only: 12-18%. Via email only: 8-14%. Via phone only: 18-25%.
Multiplication effect: multi-channel 5-touch outperforms single-channel 5-touch by ~2× for the same dollar/time cost. Patients respond to different channels. The sequence covers the gaps.
The optimal 5-touch sequence
Touch 1 (day 0, email): The longest-content-allowed-touch. Explain the context. Offer two specific times.
Touch 2 (day 3, SMS): 'Hi {first} — sent you an email, wanted to make sure it landed. Want one of those times?'
Touch 3 (day 7, email): Second email, different subject line. 'Still good for a cleaning?'
Touch 4 (day 10, phone): Front-desk call. 30 seconds, not a pitch.
Touch 5 (day 14, SMS): 'Last check-in from us this month. No hard feelings either way — want back on the schedule or should we leave you alone?'
Rate-limited to TCPA-safe 1/day + 3/week per patient.
Don't do 6+ touches
Diminishing returns curve hits hard at touch 5. Touch 6 adds 0.3-0.5 percentage points. Touch 7-8 adds unsubscribes and spam complaints. The ceiling is physics, not tooling.
Automating all this
The 5-touch sequence with proper segmentation + reply-intent classification + rate limiting requires automation. Doing it manually at 500 lapsed patients = 250+ hours of front-desk time. [Automated tool that runs this end-to-end →](/) with [your practice's specific numbers →](/calculator.html)
Frequently asked
Is SMS higher-ROI than phone?
Per hour of front-desk time: yes by 5-8×. Per individual contact: phone converts higher. Use both in the same sequence for best outcomes.
Can I run phone outreach without TCPA concerns?
Phone calls to existing patients about their care are exempt from most TCPA consent requirements. Calls to prospective new patients require written consent (different story).
What's the best time gap between touches?
72-96 hours between touches 1-3, then 4-5 day gaps for touches 4-5. Faster feels spammy; slower loses momentum.
Want to put this on autopilot?
The 5-touch reactivation sequence runs end-to-end in [usdpr.](/) — pre-written templates, reply-intent AI, TCPA rate limits enforced in code. 14-day free trial, no card.