Supplies are the leak a practice owner laughs off. Next to insurance write-offs and empty chairs it feels like pocket change, and it is the one line on the P&L that everyone calls "the cost of doing business." It is worth a harder look, for two reasons.
The first is that it is going up whether you like it or not. Since January 2021, the price index for professional dental equipment and supplies that the ADA Health Policy Institute tracks has risen 23%, while reimbursement across all payers has risen 19% — the squeeze between what a practice pays and what it is paid. In the Institute's survey of dental practices, comparing 2021–25 with the five years before it, general dentists' inflation-adjusted expenses per dentist rose 4.9% while revenue per dentist rose 1.4%, and their average real income fell 8.1%. The second reason is the useful one: of all the expenses in that squeeze, supplies are the only line an owner can move this month, without a hiring decision or a contract negotiation. This guide is about how — where the money goes, why there is no honest benchmark, how to find your own number in ten minutes, and the ten-to-twenty-item weekly count that turns the supply closet into a number you can manage.
- Two leaks, both invisible
- Why there is no honest benchmark
- Your number, in ten minutes
- Do not manage two hundred items
- Two numbers per item
- The weekly count
- Read the trends, then tune the numbers
- How one practice did it
- Run your own numbers
- Sources
Two leaks, both invisible
Supply money leaks two ways at once, and neither ever appears as a line called "waste."
Too much. Every extra box on the shelf is cash that cannot work anywhere else in the practice. Then the box expires — composites, anesthetics, bonding agents, anything with a date on it — and goes in the bin, and the money went with it. The dollar value of what goes in the bin is rarely written down anywhere, so the leak stays invisible month after month.
Too little. An item hits zero on a Wednesday. Someone notices too late, and the order goes out overnight: a rush price, expedited shipping, sometimes a different supplier at whatever they charge. The panic order is the most expensive way to buy anything, and it is bought precisely because nobody was counting.
Both leaks pad the same category on the P&L, and because the category only ever grows a little, nobody asks why. That is what makes supplies different from the other leaks in a practice: the money is not hidden in a fee schedule or an empty hour. It is in the closet, and you can walk in and look.
Why there is no honest benchmark
Ask what supplies "should" be as a share of production and you will get a number — from a consultant, a supplier, a forum — and then a different number from the next one. The ranges disagree because the practices behind them disagree: a surgical practice and a hygiene-heavy one; a practice that books lab fees as supplies and one that does not; a practice that counts gloves and one that files them under overhead. Some of the figures are shares of collections and some are shares of production, which alone changes the answer, because collections and production are not the same number. The ADA's survey reports what practices actually spend, on average, not what any one of them ought to.
So this guide gives you no target. It gives you something more useful: your own number, measured the same way every month, moving in the right direction. A practice that goes from whatever it is to a point and a half lower has done something real. A practice that matches a benchmark has matched an average of practices it does not resemble.
Your number, in ten minutes
Two things tonight, and you will know whether this leak is worth your attention.
First, the rate. Take last month's supply spend from your ordering system or your accounting software, and last month's production from your practice-management system. Divide the first by the second. That is your supply rate. Write down which denominator you used — production or collections — and use the same one every month from now on, because the trend is the point, not the level.
Second, the shelf. Open one supply cabinet and check the expiration dates on the five oldest-looking boxes.
Between the rate and what you find at the back of the shelf, you will know within minutes. And the arithmetic that makes it matter is simple: every point of that rate, on a million dollars of production, is ten thousand dollars a year — every year, for as long as the point stays off.
Do not manage two hundred items
The instinct, once you have looked, is to get organized: count everything, track everything, a spreadsheet with every item. That instinct is what kills an inventory effort by week three. A list of the common dental supplies runs past two hundred items, and nobody has time to count two hundred items every week.
The leak does not live in two hundred items. It lives in ten to twenty, and you already know which ones: the items that expired on you in the last six months, and the items you had to rush-order in the last six months. Those are your critical items. Mark them, watch them, and leave the rest alone. A box of cotton rolls has never bankrupted anyone.
Two numbers per item
Every critical item needs two numbers, and between them they cap both leaks.
The ideal quantity is the most of the item worth having on hand. It caps the overstock leak: nothing above it gets ordered, so nothing above it can expire on the shelf.
The buy point is the on-hand level that triggers a reorder. It caps the rush-order leak: when a count comes in at or below it, the order goes out on your terms, with days to spare, at planned prices. The buy point always sits below the ideal quantity.
Where do the values come from? Four things: how fast you use the item, how long your supplier takes to deliver, how often you place orders, and a margin for safety. An item you go through at fifty a week, from a supplier who delivers in two days, ordered monthly, sits comfortably at an ideal quantity of about 250 and a buy point of about 150 — four weeks' use plus a margin at the top, three weeks of cover at the bottom, enough to order and receive before the shelf is empty.
Do not agonize over the first values. Sensible defaults exist for the common items; start with those, and resist changing them for the first several weeks. The numbers are meant to be tuned from your own usage, and you will not have any usage to tune from until you have been counting for a while.
Want the ten to twenty supplies that bite you watched for you — a buy point on each, a weekly count from your phone, a to-order list? The 100 Day Profit Reset Protocol is free for your first hundred days — every tool, no credit card, nothing to cancel.
The weekly count
Here is the discipline, and it is the only one this leak asks of you: once a week, same day every week, count the critical items.
Do it in the supply room, on a phone, with the list in front of you: for each critical item, the quantity on hand, entered as you go. Any item at or below its buy point stands out. Filter to the items that need ordering, place the orders in whatever system you already use, and clear the recommendations. Ten to twenty items takes fifteen to twenty minutes.
Two things about that time, said plainly. It is a real, dedicated block — unlike most of what a well-run practice does with its numbers, it is not absorbed into checkout or the phone; it is a habit that has to be kept. And it is the whole cost of the fix. Nothing else in this guide takes time the practice is not already spending on supplies; the count simply moves that time from the panic order to the Monday morning.
Read the trends, then tune the numbers
Every weekly count is a data point, and after a couple of months the data points make two graphs per item: on-hand quantity by month, and recommended orders by month. Reading them is one skill with two patterns.
Bars riding high all year — an item whose on-hand count never comes near its buy point — means cash tied up on the shelf. Lower its ideal quantity. This is where the expensive, slow-moving items hide: an item worth a thousand dollars a unit that starts the year at eleven and ends at six, with five used, never needed more than five or six on hand — the other six units, six thousand dollars, sat on a shelf all year, and some of them are now past their date.
Bars scraping zero — an item that keeps hitting empty between counts — means rush orders waiting to happen. Raise its buy point, and its ideal quantity with it.
Read the graphs monthly, change one number at a time, and let the next month's counts confirm the change. As the numbers settle, the habit shrinks: counts that were weekly can move to every two weeks, then monthly, because the waste they were catching has stopped happening.
How one practice did it
Dr. Prachi Deore runs Coppell Smiles, a solo practice in Coppell, Texas, and hers was the first practice on Profit Smiles — the tools were proven there before they were offered to anyone else.
Her practice counts on Monday mornings, before the first patient. She started with the defaults rather than designing quantities from scratch, marked her expensive items as critical alongside the ones that had expired or run out, and tuned from the graphs a number at a time. Supplies in her practice went from 11.3% of production to 9.8% — a point and a half, which on her production came to about $13,500 a year that stays in the practice now.
As she puts it in the protocol's own training, that one habit "is what turned our supply line from a mystery into a number we control."
Run your own numbers
The free supply cost calculator on this site puts dollars on both leaks from your annual supply spend and two estimates: the share of it that expires or is thrown away, and the extra you pay on rush orders as a share of the year's spend. With your annual collections it also shows supplies as a share of collections — its own denominator, so compare it only with itself from month to month. It opens with an example practice's figures; replace them with yours, and nothing you enter leaves your browser.
Stock Sentry runs the count: a list of common dental supplies ready on day one, the critical items marked, an ideal quantity and a buy point on each with sensible defaults, the weekly count from your phone, the to-order list, and the two graphs per item that tell you what to tune. It is Step 8 of the protocol — an introduction and four short videos, one of the shortest setups of the seven — and then one count a week, about fifteen to twenty minutes, for as long as it takes the waste to stop.
Sources
- ADA Health Policy Institute, The State of the U.S. Dental Economy, 2nd Quarter 2026 Update: since January 2021 the producer price index for professional dental equipment and supplies is up 23% and hourly earnings of dental office staff up 23%, against overall inflation of 27%; the all-payer reimbursement index is up 19% over the same period (Bureau of Labor Statistics data reported by HPI).
- ADA Health Policy Institute, Trends in Dentists' Income, Revenue and Hours Worked (June 2026), from the Survey of Dental Practice: for general practitioners, inflation-adjusted revenue per dentist rose 1.4% and expenses per dentist rose 4.9% between the pooled periods 2016–20 and 2021–25, while average income fell 8.1%; the average net income of general dentists was $215,320 in 2025.
- "Every point of that rate on a million dollars of production is ten thousand dollars a year" is arithmetic, not a benchmark. Dr. Prachi Deore's results are those of one practice, measured in the platform — supply spend divided by production, with the dollar figure being the difference applied to her practice's production; individual results vary.