The tool is no better than those that are sold in our stores. Home inspection - white bowls after tea (plaque from tea is tea after each). Powder with a touch on the first try failed, when said dosage used by the manufacturer. In the second "wash" was filled to a maximum of closing the cover of the powder compartment, then washed away plaque. In general, a plus for environmental friendliness, but not a strong negative for efficiency.