Delivery OK. This is very useful to do once to see hard to reach in his teeth but then I do not think it again. But it's worth it to do as poorly brushed places are not at all those that were expected. The instructions may explicitly. Already you should brush your teeth before use otherwise everything is red. And concretely must chewable compress and after rinsing the mouth. I took 2 tablets 1 because it is right. That !!