Building an AI System That Reduced Dental No-Shows by 35%

Here's a problem I didn't expect to find fascinating: dental no-shows. Turns out, Irish dental practices lose €30,000–€75,000/year to patients who just... don't turn up. The industry-wide no-show rate sits at 8–15%, with urban practices hitting 20%. The Technical Challenge The interesting part from an engineering perspective: 76% of the time, dental practices are unreachable by phone. They're open ~40 hours/week out of 168. That means the majority of cancellation attempts happen when nobody's there to pick up. So the patient who knows on Friday evening they can't make Monday's appointment? They call, get voicemail, mean to call back, and forget. Empty chair. The Multi-Channel Reminder Pipeline We built a 3-touch reminder system: T-7 days → SMS with one-tap confirm/reschedule link T-48 hrs → WhatsApp message (higher open rate than SMS in Ireland) T-2 hrs → Voice call for unconfirmed appointments Each channel has different engagement rates: SMS: ~95% delivery, ~35% response WhatsApp: ~98