takes forever ti get off your teeth after you brush n brush n brush again

I bought this product for my children. I thought it would aid them in brushing their teeth better. I found it just turned the whole mouth blue (it turns blue on spots in your mouth that need brushing the most) ~ even when your teeth have just been brushed. I also found the color to stain on the counter top when it dripped on there. It smells nice, but I would rather just invest my $$ in better toothpaste and some mouthwash. I found it to be quite expensive for something that does not work that great.