Aussie and Max are right..........but there might be tooth paste used for small children that would work too..........I am not sure, but I think we had it when our youngest son was very small and learning to do it on his own. Obviously little kids won't rinse and spit as well as they should either
And YES, artifitial sweeteners ARE harmful to your dogs...........or so I have read.
I may look into that myself, as I find it harder and harder to trust anything made specifically for pet ingestion, LOL