Quick Answer

Lock the month in Open Dental right after every provider payroll run, and lock monthly if you can. Locking sets a global date that freezes procedures, payments, and chart entries so nobody can edit them later. That protects provider pay, makes embezzlement harder to hide, and keeps your patient charts defensible as legal documents. If you find a mistake in a locked period, fix it under today's date. Don't unlock the past to patch it.

How Often Should You Lock the Month in Open Dental (and Why This Is a Security Issue, Not Just an Accounting One)

If you came from a different practice management system, you're probably used to some kind of formal end-of-day, end-of-week, or end-of-month closeout. Open Dental doesn't work that way. There's no button you have to press to "close" anything. Which means the safeguard that used to happen automatically in your old system doesn't exist here unless you build it yourself. That safeguard is called locking the month, and most practices either don't know it exists or don't take it seriously enough.

I want to change that, because this isn't really an accounting nicety. It's a security control.

What Locking Actually Does

Locking the month tells Open Dental that everything on or before a certain date is final. Once that date is set, nobody can go back and alter historical data before it, not a procedure code, not a payment, not a chart entry. You go into Security, then Global Security, and set the lock date to the last day of whatever period you're closing out. Anything before that date is frozen.

This isn't something every employee should be able to do, and by default, it isn't. It requires full admin clearance in Open Dental. That's intentional. The whole point of a lock is that it can't be casually undone by whoever happens to be logged in that day.

Why This Is a Security Issue, Not Just a Reporting One

Most people who've heard of month locking think of it purely as an accounting best practice, keeping your numbers clean, making sure reports don't shift after the fact. That's true, but it's the smallest part of why this matters.

Here's the bigger picture. When historical data can still be altered, you've left a window open, and that window doesn't care whether the person walking through it has good intentions or bad ones.

On the honest end, this is a provider pay problem. If you pay providers based on production or collections, and someone can still edit a procedure or a payment from a month you already paid out on, you have no way of knowing your numbers were accurate at the time you cut that check. Run the report again later, after something's been quietly changed, and now a provider is pulling their own numbers and asking why they were shorted. That's not a hypothetical. That's the exact conversation a locked system prevents you from ever having to have.

On the dishonest end, this is bigger than a reporting inconvenience. Dentistry is consistently one of the most embezzled-from industries there is, and an unlocked system is exactly the kind of gap that makes it possible to happen quietly, sometimes for years, before anyone notices. If historical financial entries can be edited without a trace showing exactly when and by whom, you've removed your own ability to catch it.

And there's a legal layer here too. Patient charts are legal documents. If treatment notes, procedure codes, or billing entries tied to patient care can be altered after the fact with no record of it happening, that's not just messy bookkeeping, that's a real liability if a chart is ever reviewed, audited, or brought into a dispute. A locked system creates a clear, honest paper trail. An unlocked one creates a gray area you don't want to have to explain later.

Locking the month isn't about distrust of your team. It's about removing the possibility of a quiet mistake, a shortcut, or worse, ever going unnoticed.

The Right Way to Fix a Mistake, Even in a Locked Period

Here's a question that comes up constantly. If something's locked and you find an error, do you unlock it, fix it, and relock it? No. And this matters enough to say clearly. If you find an error in a period that's already locked, whether it's a procedure billed to the wrong provider or bitewings that were never actually posted, you fix it today, under today's date. You don't reopen the past to patch it.

Say you find an error from April while you're working in July. You make the correction today. It shows up as a change made on July's date, not backdated into April like the mistake never happened. That might feel a little strange the first time, since the fix technically belongs to an April date of service, but it's the right call. It preserves an honest record of exactly when the correction happened, and it means your lock actually means something. A lock you're willing to reopen every time something needs fixing isn't really a lock, it's a suggestion.

How Often You Should Actually Be Locking

The honest answer is that locking anything is better than locking nothing. If monthly feels unrealistic right now, locking quarterly or even annually still closes most of the gap. Don't let "we can't do this perfectly" talk you out of doing it at all.

That said, here's the cadence I actually recommend, and it's not tied to the calendar. It's tied to whenever you run provider payroll. If you pay providers quarterly, lock quarterly, right after that payroll run closes. If you pay weekly, that's a harder cadence to lock against, but the principle holds, lock as close to your pay cycle as you can manage. The moment you've paid someone based on the numbers in the system, that's the moment those numbers need to stop being editable. Every day a period sits unlocked past that point is another day the door's still open.

Where to Start

If you're not sure whether your month locking is even turned on, or when it was last touched, that's a five-minute check worth making today. It's exactly the kind of setting we look at during a comp exam, because it's invisible until the day you really need it, and by then it's already too late to matter.

FAQs: Locking the Month in Open Dental

Q: How often should I lock the month?
A: Lock right after each provider payroll run. If you pay quarterly, lock quarterly. If you pay more often, get as close to that cycle as you realistically can. And if none of that feels doable yet, lock annually... it still closes most of the gap.

Q: I found an error in a locked month. Should I unlock it, fix it, and relock it?
A: No. Make the correction today, under today's date. It preserves an honest record of when the fix happened, and it keeps your lock meaning something.

Q: Where do I set the lock date?
A: Go to Security, then Global Security, and set the lock date to the last day of the period you're closing out. You need full admin clearance to do it, and that's on purpose.

Q: Does Open Dental have an end-of-day or end-of-month close?
A: No. There's no closeout button in Open Dental, so nothing gets finalized unless you set a lock date yourself. If your old system closed things out for you, that safeguard doesn't exist here until you build it.

Q: How do I know if my practice is locking the month right now?
A: Check the lock date in Security, then Global Security. If it's blank or months behind your last payroll run, that's your starting point. This is also one of the settings we review during a comp exam.