From Forbes:
Cloud-based Microsoft applications, including Microsoft Teams, went down across a swathe of the U.S. yesterday.
Users of Microsoft Office 365, Outlook, Exchange, Sharepoint, OneDrive and Azure also reported they were unable to login. Instead, they were presented with a “transient error” message informing them there was a problem signing them in.
Source: What Caused The Massive Microsoft Teams, Office 365 Outage On Monday? Here’s What We Know
If this can happen to Microsoft it can certainly happen to a dental cloud based system. As much as I love high tech and marvel at the possibilities of cloud based systems security remains a disturbing issue.