Most reasonable avenue is to keep an eye out for existing proceedings or actions against them in US or Canada in the coming years given you have time (also requires this be a legit company that is going to be around for a while or big enough to deal with a class action without just ghosting, which is quite low in this case, so that's probably the first non-starter). Sounds like you'll be at the dentist a lot anyways, so I'd at least get an estimate for future work now and then sit on it and monitor.
Those products are slapped together so cheaply and shoddily, that I'd be shocked if this was even a 'real' company that wouldn't just vaporize at the first sign of a legal issue. This sounds insanely hard to prove and then good luck a) litigating it, and b) enforcing any sort of judgement. Even a settlement is going to be tenfold more work and time than the settlement $$s would be worth if you have to start the action and complaint yourself.
Given them shutting off when overheating/battery issues is a known 'feature' (sure its a poor safety measure, but giant lithium fires are way worse I guess), chances are unless an expert engineer could ID the specific fault on this unit above and beyond that feature, as well as the company's specific fault for it, you'd be up #### creek anyways, especially since an expert engineer that does that sort of work isn't going to do it for free.
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