It's weird because I'm seeing this page [1] say the exact opposite of what I'm reading here:

"Prescribing a night guard to a person with sleep apnea will stop the teeth from becoming damaged, but will not address the much more serious issue of keeping the person breathing at night. [...] The scientific evidence that bruxism can be a symptom of sleep apnea has come from studies that were relatively recent, and not all dentists are aware of this information yet. This is why many dentists are still prescribing night guards for bruxism without screening for sleep apnea."

[1] https://millcreekdentistry.com/why-a-night-guard-for-teeth-g...

FWIW, some mouth guards are actually beneficial for your bite, though I can't comment on tooth damage. I bought Invisalign from my dentist which is a specially-made acrylic mouth guard that is designed to realign your teeth/jaw, and probably also serves this purpose... unfortunately, I'm allergic to acrylics so I had to stop using it.

I've yet to successfully fall asleep while using a CPAP, so I wish this was an alternative for me. Alas.

It's true, my SO had to switch from a mouth guard to a CPAP machine because the guard was changing their bite "pattern" to worse.