Going by a quick skim of the 2022 WHO oral health numbers, Sweden[0] doesn't seem significantly worse off oral-health wise than Germany, Holland, or the UK. In fact it's oral cancer incident rates appear a bit better. Though the UK doesn't have great cancer incident rates, it's periodontal disease rate seem to be significantly lesser than the other three (perhaps due to close monitoring as a result of the "bad British teeth" stereotype).

Sweden male tobacco use percentages are slightly higher than the other three countries, which might be a function of the population additionally using non-cigarette tobacco substitutes perhaps as was mentioned by others.

[0] https://cdn.who.int/media/docs/default-source/country-profil...

Not cancer. Because it's, again, not the nicotine that causes the cancer. Snus does NOT increase cancer risk.

It decreases cavities by a lot (presumably because the bacteria doesn't like the environment anymore), but also destroys your gums. All in all, depending on your dosage it could be a wash or even positive for your oral health.

It's absolutely disgusting, but it's not dangerous :P