Investigation of the Instant Tooth Whitening Effect of a Silica Toothpaste Containing Blue Covarine

The study investigates the effect of toothbrushing with a toothpaste containing blue covarine compared to a control toothpaste without blue covarine on tooth color. Participants brush their teeth once with either the blue covarine containing toothpaste or a control toothpaste for two minutes. Before and after brushing, tooth color is assessed with a spectrophotometer. Moreover, satisfaction of the participants with their tooth color is assessed using a numeric analogue scale before and after treatment. The null hypotheses are that neither brushing with the toothpaste containing blue covarine nor brushing with the control toothpaste change a) the tooth color and b) the satisfaction of the participants with their tooth color.