Most dentists know their chair-time revenue. Almost none know their patient LTV. That gap is why the average independent practice spends 4 - 6% of revenue on marketing when the math supports 8 - 12%.
The formula
LTV = (visits per year × average visit value) × years retained × gross margin
The simpler operator version drops gross margin (since dental margins are roughly comparable practice to practice) and gives you a top-line LTV:
LTV = annual revenue per active patient × average years retained
A worked example
Average general-dentistry patient
Visits per year: 2.1 (cleaning + 1 restorative)
Average visit value: $310
Annual revenue per patient: $651
Average years retained: 8.2
LTV: ~$5,338
Now layer in the variance. A practice with 65% retention sees ~5.5 years average lifespan - LTV drops to $3,580. A practice retaining 88% sees 12+ years - LTV climbs to $7,810. Retention moves LTV more than procedure mix does.
Benchmarks by practice type
| Practice profile | Annual rev / patient | Avg years | LTV range |
|---|---|---|---|
| Insurance-heavy general | $420 - $580 | 6 - 9 | $2,500 - $5,200 |
| Mixed general + restorative | $580 - $780 | 8 - 11 | $4,600 - $8,500 |
| Cosmetic / Invisalign-heavy | $1,100 - $1,800 | 5 - 8 | $5,500 - $14,000 |
| Implant / full-mouth | $2,200 - $4,000 | 4 - 7 | $8,800 - $28,000 |
Why this changes acquisition math
The standard rule of thumb: spend no more than 1/10 of LTV on acquisition, and you'll have a profitable, scalable practice. Spend up to 1/3 of first-year revenue if you're growing aggressively.
Apply that to the worked example. A $5,338 LTV patient justifies up to $533 in acquisition cost. Most paid channels deliver patients well below that ceiling - which means most practices could afford to spend significantly more, and the limit is usually their booking capacity, not their economics.
Three mistakes that crush LTV
- Treating recall as a clerical task. Every recall slip-through is $651 of annual revenue walking out the door, compounded over 8 years.
- Discounting to win the patient. A first-visit discount has near-zero impact on LTV. A bad first-visit experience cuts LTV by 40 - 60%.
- Not tracking 18-month inactives. A patient who lapses at year 2 drops LTV from $5,300 to $1,300. Reactivation is the highest-leverage retention move you can make.
See your practice's actual per-patient LTV, retention curve, and acquisition ceiling - calculated from your real PMS data. That's the Patient Revenue Report. 14 days, free.