A method for aromatherapy including recirculating shower water on a body of a bather, the shower water including at least one aromatherapy substance. The present invention is also directed prophylaxis or prophy angles for use with such handpieces. The backlight frame includes a backplane brace, a backplane, and a backplane mounting strip. The tool compares the measure with a threshold and segments a foreground region from a background region based on the measure. An information processing system includes a first storage module storing step information containing parameters, a second storage module storing values of the parameters, and a module executing steps specified by the step information in a way that replaces a parameter of the step information with a value of the parameter.