There are two entries now from US labs added.
I'm sure many more attempts are being made but are not on the chart.
Maybe Wikipedia is not always up to date and accurate?
From personal experience I need a regular cleaning every year and since I'm not cheaping out anymore on this as I did as student my teeth related health problems went to 0. I think it is useful if you aren't that disciplined with taking care of it yourself. I forget to floss every other time or simply forget to brush at times when I sit at a longer coding session and might eat during it but then forget to brush teeth afterwards. Procedure always removes plenty of scale/tartar.
Kinda funny that you have to buy/support hardware from a company but then need to use a opensoure nonprofit OS to protect yourself against said hardware producer.