I also don't understand the difference. Some cost a few 0,1% less, some more. When you try to compare they differ in many tiny things like paying for profession

I also don't understand the difference. Some cost a few 0,1% less, some more. When you try to compare they differ in many tiny things like paying for professional tooth cleaning once a year or paying for a a certain periodic checkup or not etc. Hard to do objective comparison without much work and exacly knowing what you need. I'm still in the one my father decided for the family when I was a kid xD