Pull the call report by hour and the same twenty minutes will be missing every day
Missed calls in a dental practice are not random; they cluster around the moments the front desk is doing something else, and the pattern is visible in one report.
Ask your phone system for calls by hour of day, answered against missed, over the last ninety days. The shape is usually obvious within a minute of looking. If you switch on call recording while you are in there, the rules for recording and for holding anything that touches health information are worth setting up with your own counsel first.
The gaps sit where you would expect. Checkout, the handoff at lunch, the last half hour of the morning when two patients are at the desk at once. A patient in pain does not wait through that; they call the next practice.
Fix it with staffing or with routing, not with willpower. An overflow number, a second person covering the known windows, or a service that can actually book rather than take a message.
Every missed call should trigger an automatic text within a minute or two, in plain language: sorry we missed you, are you in pain, here is a link to a time. Callbacks placed an hour later reach voicemail.