Xylitol is the name of the active ingredient is no picnic. It tastes like sugar, but it does not act like sugar but better! ;-)
I rinse 3 times a day with the powder (this exact fine-grained consistency in my opinion, is very well suited for beginners and people with sensitive teeth) and they are smooth, without linings and without pain! The tongue is healthy reddish and no longer occupied, the taste exceeds all sweeteners from Stevia Aspertam up to worlds, it can be dosed as sugar and the only side effect I could make out: consumed in high doses, it has a laxative effect.
I can recommend it to anyone, professional dental cleanings are more expensive and do not taste as sweet :-)