The problem with a two-day course is not what it teaches. It's that two days is exactly long enough to remove the fear that would otherwise keep someone safe.
A competent injector needs three things: knowledge of anatomy, technical skill, and judgement about when not to proceed. A short course can transfer the first. It can begin the second. It cannot produce the third, because judgement comes from having seen things go wrong — your own cases, repeatedly, under someone who can tell you why.
I've spent most of a decade teaching, and the pattern is consistent. Delegates leave a foundation course confident. They should leave uneasy. The uneasiness is the accurate response to what they now know, and it's the thing most reliably trained out of them by a curriculum designed to send people home feeling good about their purchase.
Anatomy taught as a diagram rather than a variable
The facial vasculature is not fixed. It varies between people, and the textbook depiction is a common case rather than a rule. Teaching a map and not teaching that the map is unreliable produces practitioners who inject with false confidence in exactly the planes where confidence is most dangerous.
Complications taught theoretically
Almost every injector can recite the management of a vascular occlusion. Very few have managed one. The gap between reciting a protocol at 11am on a course and executing it at 7pm in your own clinic, on your own patient, with your own adrenaline, is enormous and cannot be closed by a handout.
No follow-through
Most training relationships end when the course does. Nobody reviews the delegate's first fifty cases, which is precisely where the learning is available and where the errors are still small enough to correct.
The ultrasound question
Bedside ultrasound is moving from a curiosity to a reasonable expectation in this field. It lets you see the vessel rather than infer it, and it changes complication management from guesswork to a targeted intervention. It is not yet routinely taught at foundation level. It should be, and the reason it isn't is that it takes time and makes courses harder to sell.
None of this is an argument that only surgeons should inject. It's an argument that competence is a trajectory rather than a certificate, and that an industry which sells certificates has no commercial reason to say so.