Dental answering services bill one of three ways: per connected minute, per call handled, or a flat monthly subscription. Per-minute and per-call bills move with your call volume and rounding rules; flat pricing does not. The real comparison is not the headline rate but cost per booked appointment after setup fees, overages, and surcharges.
Updated August 23, 2026 · 7 min read
If you are still deciding whether you need phone coverage at all, or what the different service types do, those questions are answered elsewhere: what is a dental answering service explains the categories, and the dental answering service overview covers capability. This page assumes you have decided to buy something and want to understand the invoice before you sign it.
We are also not naming vendors. Rates change, quotes are negotiated, and a public comparison of named competitors ages badly. What does not change is the structure of how these services bill — and that structure is where the surprises live.
| Model | What you pay for | What makes the bill spike | Best fit |
|---|---|---|---|
| Per minute | Connected talk time, usually rounded up; sometimes hold and wrap-up too | Long calls, chatty callers, complex scheduling, aggressive rounding | Very low, predictable overnight volume |
| Per call | Each call handled, regardless of length | High volume of short calls, wrong numbers, robocalls if not excluded | Message-taking only, low call counts |
| Flat monthly | A fixed subscription per practice or per location | Nothing volume-related; the number is the number | Any practice with variable or growing volume |
The distinction that matters operationally: under the first two models, a good call and a bad call cost the same, and a longer call costs more. That quietly puts your interests and the vendor's on opposite sides. Under flat pricing, a call that takes four minutes because the patient had insurance questions costs exactly what a thirty-second wrong number costs — nothing extra.
The number on the quote is rarely the number on the invoice. Ask about each of these in writing before signing:
One question cuts through all of it: send me a sample invoice for a practice like mine at my call volume. A vendor who will not produce one is telling you something.
Because dental call volume is lumpy and rounding is unforgiving. Mondays run heavy. The day after a holiday runs heavier. A storm, a school closure, or a marketing campaign that finally worked all produce weeks that look nothing like the month you were quoted on.
Rounding compounds it. If calls are billed in one-minute increments and rounded up, a month of many short calls costs far more than the raw talk time implies — a fifteen-second wrong number can bill as a full minute. Ask two specific questions: what is the rounding increment, and does billable time start at answer or at connect to a live agent. Those two answers explain most bill variance.
Comparing a per-minute quote to a flat subscription by looking at the headline numbers is meaningless — different units. Normalize both to cost per booked appointment:
Example math — the inputs below are placeholders, not market rates; substitute your own quote:
| Line item | Usage-based quote (illustrative) | Flat monthly (illustrative) |
|---|---|---|
| Base fee | Your quoted base | Included |
| Usage | Your rate × billable minutes (after rounding) | $0 |
| After-hours premium | Your premium × off-hours share | $0 |
| Spanish handling | Your surcharge × Spanish call share | $0 |
| PMS booking | Add-on, if offered | Included |
| ÷ appointments booked | = cost per booked appointment | = cost per booked appointment |
The denominator is the part practices skip, and it is the part that decides the answer. A cheap service that takes messages you have to call back is not cheap — it moved the work rather than removing it, and every callback is front-desk time you are already short of. Weigh that against what unanswered calls already cost you: how much missed calls cost a dental practice, and the ROI calculator.
There is also a cost most quotes never show: the calls a service cannot handle. If it can only take a message, every scheduling call is deferred, not resolved, and the deferred work lands back on your team the next morning.
Flat, per location, no per-minute charges and no after-hours or bilingual surcharges:
| Plan | Monthly | Shape of practice |
|---|---|---|
| Starter | $249 | After-hours and overflow coverage |
| Core | $399 | Full-time 24/7 answering with SMS reminders |
| Growth | $599 | Adds the reactivation engine and revenue reporting |
| Multi / DSO | $899 per location | Groups and DSOs |
Annual billing is 15% less. Full plan details are on pricing. What is included on every plan rather than metered: bilingual English and Spanish handling with language detected on the call (bilingual), booking written into Dentrix, Open Dental, or Eaglesoft during the call with double-booking protection (scheduling), 24/7 answering (AI receptionist), and a BAA signed before any live patient data (BAA, security).
Dentovox is not an emergency service — emergency callers are escalated on your on-call path and directed to 911 when appropriate.
There are three common billing models. Per-minute billing charges for connected talk time, often rounded up and sometimes including hold and wrap-up time. Per-call billing charges a flat amount for each call handled regardless of length. Flat monthly billing charges a fixed subscription per practice or per location. Per-minute and per-call bills vary with volume, while flat billing does not.
Common charges outside the headline rate include setup or onboarding fees, monthly account or base fees charged before any calls, overage rates once a bundled block of minutes or calls is used up, after-hours or holiday premiums, Spanish or bilingual handling surcharges, per-message delivery fees for texts and emails, call recording or transcript storage, and integration fees for writing appointments into your practice management system.
Because usage-based billing tracks call volume, and dental call volume is not flat. Mondays, the days after holidays, weather events, and marketing campaigns all spike it. Rounding rules amplify the effect: if every call is rounded up to the next minute, a month of short calls costs disproportionately more than the raw talk time suggests. Ask for the rounding increment in writing.
Add the recurring base fee, the expected usage charge at your real call volume, any per-message and per-integration fees, and the amortized setup cost, then divide by the number of appointments the service actually books for you. Cost per booked appointment is the only figure that lets you compare a per-minute vendor against a flat-rate one honestly.
Per-minute tends to be cheaper for very low, predictable volume, such as a small practice using coverage only for a few overnight calls. Flat rate tends to be cheaper once volume rises or becomes unpredictable, and it removes the incentive to keep calls short. If your bill has ever surprised you after a busy month, you are paying the variability premium of usage-based billing.
Dentovox is flat monthly pricing with no per-minute charges: Starter is 249 dollars per month, Core is 399, Growth is 599, and Multi or DSO is 899 per location per month. Annual billing is 15 percent less. Every plan is bilingual English and Spanish and writes bookings into Dentrix, Open Dental or Eaglesoft.
Billing structures described above reflect common industry practice†; the example math uses placeholder inputs, not market rates — substitute the figures from your own quote. Dentovox prices are current list prices, see pricing.
† Industry estimates, not Dentovox's measured results.