The short answer
Your booking tool sends a recall at the interval you set, with a one-tap rebooking link, in a message that reads like it came from you. You configure it once, you test it, and then you check every month that it is still going out.
That is the whole mechanism. It is the single most valuable thing on a hygiene clinic website, because it is what turns one visit into a patient for ten years.
Why the recall beats everything else you could do
An independent hygiene clinic is a business built on habit. New patients are expensive to find: you compete on search, you answer price questions, you explain direct access, and you hope. A returning patient costs one message.
Most clinics that feel like they have a marketing problem actually have a recall problem. The patients came, were happy, and were never asked back at the right moment. Six months is long enough to forget, and nobody has a reminder in their own calendar for a hygiene visit.
The three settings that matter
The interval, held per patient. A default at your usual gap, most often six months, with the ability to set three or twelve on the individual record. If changing the number on a record does not change when the message goes out, the setting is decorative.
The link, going straight into booking. Not to the home page. Not to a contact form. To the booking flow with the returning patient appointment already selected, so the whole thing is two taps on a phone.
The channel your patients actually read. Text is usually opened, email is usually not, and most tools do both. Check what your consent covers before switching one on.
Write it like a person
A recall is not a marketing email. It is a short note from the person who cleaned their teeth.
Name the clinic, say it has been about six months, give the link, give the number for anyone who would rather ring, and stop. No offer, no urgency, no countdown. A hygiene visit does not need selling to somebody who already came once and liked it.
Send one message at the interval, and one polite follow-up a fortnight later if nothing happens. Then leave them alone. A third and fourth chase converts nobody and costs you the unsubscribe, which costs you every future recall as well.
Book the next one before they leave
The strongest version of this is not automated at all. Booking the next visit at the end of the current one, while the patient is standing at the desk, converts far better than any message sent months later. The recall then becomes a reminder of an appointment that already exists, which is an easier message again.
Use the automatic recall for the ones who would not commit on the day, not as a replacement for asking.
Reminders are a different job
A reminder goes out before an appointment that already exists and protects the slot. A recall goes out after a gap and creates a new one. Most booking tools treat them as separate settings, and a clinic needs both switched on. Turning on reminders and assuming recalls are covered is a common and expensive mistake.
The failure nobody notices
Recalls fail silently. A software update, an expired integration, a changed template or a message-credit balance running out will stop them, and nothing on your screen says so. You find out three months later when the diary looks thin and you cannot explain why.
So make it a checkable thing. Once a month, look at how many recalls went out and how many appointments came back. Most tools will show both numbers somewhere. Five minutes, and it protects the part of the business that pays for everything else.
What the website contributes
The site is not what rebooks anybody, but it has to hold up its end. The rebooking link has to land on a page that loads in about a second on a phone, with the appointment already chosen and the price visible if the patient wants to check it. If the link opens a slow page or asks a returning patient to register again, the recall converts far worse than it should.
Where this sits
Booking with automatic reminders and recalls, configured around Dentally, Software of Excellence, Cliniko, Jane, Acuity or Square Appointments, is the core of a hygiene clinic website as we build it, and a care plan keeps the recall messages working after every software update, the same as on the dental practice websites we look after. Packages are on pricing. Ask at the desk, and let the recall catch the rest.