Is riding bitless safe?

Hello there, I've been hearing a lot about the bitless riding trend in the equine community lately. As someone who cares deeply about the well-being of my horse, I'm curious about the safety aspect of this practice. Could you elaborate on whether riding bitless is indeed SAFE for both the rider and the horse? Are there any potential risks or downsides that I should be aware of? Additionally, what kind of training and expertise is required to ensure a smooth and safe bitless riding experience? I'd appreciate any insights you can share on this topic.