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.
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
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...