How do you determine which side of your palate is narrower?

Thanks for everything you do, Katarina! Just following your YouTube videos I’m already feeling and seeing improvements. I currently have braces that are supposed to fix my open bite on my left side. It has helped. But I really feel like adding your routines have made more of a difference the past month than almost a year of braces. You also explain why I have the open left side bite. It’s not just my teeth but my whole skull and body contributing. I wish I found all this before I got braces again. I’m 38 years old! lol 🫠

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Hi! How do you determine which mouthguard to buy?