

Physically, I don’t think so; the main enzyme in saliva mainly digests starch, which humans are not made of
More likely, you’d drown eventually due to not being let out, which would be one of the crazier ways to die I guess, up their with that time when some nobles drowned in fecal matter










… This may sound a bit pessimistic, but I think the main thing to look for is whether there are viable ways for one to enter said new country in the first place
Using the Low Countries as an example… For non-EU (or a select few countries) citizens, these three only grant residency permits to people who have a really good reason to be there… I believe they allow things such as having a job, having family, going to university, and some other situations. NL has the DAFT visa, but that’s only for American citizens (I believe?) and is quite difficult to follow-through
Depending on how young… maybe uni would be a good bet? NL has some extremely strong universities. I’m not familiar with the system there though, from what I just looked up looks like they’re quite expensive for non-EU citizens
There are a ton of other things to consider too but at least for me the most difficult part is to get a job in the first place so… everything else (climate, culture, language, …) was an afterthought by that point