Hi and thank you for sharing your question! I use cannula for most filler injections and I really cannot see a disadvantage in using it for lip injection. Fewer entry points, less risk of damaging blood vessels and other sensitive structures, more control and more precise injection of the filler, improved results, and reduced bruising and swelling are among the advantages. The only disadvantage I can think of is that not all doctors use cannulas for filler injection and it might be hard to find a highly experienced cannula injector in some area. At my practice, I use cannula whenever possible and my patient never have to pay extra for that. I hope it helps and good luck!
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