The honest version of "does it integrate with my software." These are the systems this industry actually runs on, and what each one means for a build.
DentrixPractice management
A dominant system of record — scheduling, clinical charting, treatment plans, ledger and insurance. Integration typically runs through its developer program or through direct database access depending on deployment, so establishing reach comes first.
EaglesoftPractice management
The other major system, similar in scope. Same caveat about how an integration actually connects.
Open DentalPractice management
Notable for an open database and a genuinely accessible interface, which makes it by far the easiest of the three to build against.
Insurance verification and claimsRevenue cycle
Eligibility checks before appointments and claim submission after, through a clearinghouse and a set of payer portals. High volume, deadline-bound, and the largest single administrative cost in most practices.
ImagingClinical
Sensors, pan and 3D imaging tied to the patient record. Relevant mostly as attachments that claims require.
Patient communicationFront office
Weave, Solutionreach, Lighthouse or similar, handling reminders, confirmations and two-way texting. Owns the patient text thread, so anything patient-facing works with it rather than around it.
Online scheduling and reviewsPatient acquisition
Booking widgets, recall campaigns and review generation, usually bolted on and rarely reconciled against what actually got scheduled.
Payroll and accountingBack office
QuickBooks alongside payroll, with production and collection numbers that rarely agree with the practice management system without effort.