COGS Percentage: Specialty vs General Practice

"COGS" sounds like retail language, but every practice has it: supplies, lab fees, and implant or aligner parts. It's the cost that scales directly with production, and it looks very different in a specialty practice than in a GP office. If you're comparing your numbers to a generic benchmark, you're probably comparing against the wrong practice type.

What counts as COGS in a dental practice

Keep it to three buckets: clinical supplies, lab fees, and case-specific hardware (implant fixtures, abutments, aligner lab costs). Don't put rent, staff wages, or marketing in here. Those are overhead, and mixing them ruins the comparison.

Measure each bucket as a percentage of collections, monthly, from your P&L. Not production. Collections is the money that actually landed.

General practice benchmarks

A typical GP office runs 4 to 7% on supplies and 6 to 10% on lab, so total COGS lands around 10 to 15% of collections. Where you sit in that range mostly depends on your crown-and-bridge volume and whether you've moved to in-house milling.

A GP doing mostly hygiene, fillings, and single crowns with an outside lab sits near the top of the lab range. A practice with in-office milling trades lab fees for materials and machine costs, and usually nets out a few points lower once the unit is paid off.

Specialty benchmarks

Specialties spread wide, and this is where generic benchmarks fail:

Oral surgery and periodontics with heavy implant volume: 15 to 25% of collections. Fixtures, abutments, membranes, and grafting materials add up fast. A $4,000 implant case can carry $700 to $1,000 in parts.

Orthodontics: 10 to 18%, driven almost entirely by aligner lab fees. Bracket-and-wire cases run cheaper, often under 8%, which is why aligner-heavy practices feel margin pressure that wire practices don't.

Endodontics: often 5 to 8%. Files and sealers are real money, but there's no lab bill. Endo has the leanest COGS profile in dentistry.

Pediatric: usually 5 to 9%. High patient volume, low per-visit material cost.

How to use your number

First, trend it. A GP whose supply line creeps from 5% to 7% over six months usually has an ordering problem, not a pricing problem. One person should own ordering, with a monthly budget pegged to collections.

Second, check COGS before you judge margins by specialty. An implant-heavy surgeon at 22% COGS can still out-earn a GP at 12% because the revenue per hour is so much higher. The percentage only matters against the right peer group.

Third, if lab is your biggest line, negotiate it. Labs discount 5 to 10% for consolidated volume, and most GPs split cases across 2 or 3 labs out of habit. Consolidate, then ask.

COGS won't sink a practice the way total overhead can. But it's the fastest overhead line to fix: no leases to break, nobody to let go. Pull your last 3 months of statements and put your number against the right benchmark this week.