Delivered today, literally ran to the bathroom to see my nice new white smile emerge, videoed it to show my sister…. expected to see some change in colour by using the purple serum, given the amazing reviews on line and videos on social media… the result was… NOTHING. Literally no change whatsoever. What an absolute waste of money and a marketing scam. Reading the returns policy, they won’t accept the customers feedback that it doesn’t work, only an ‘expert’. Very unhappy. Update: gave it a second try, teeth still no whiter, but lips and tongue look cyanotic blue now, perhaps I should have titled this review “only useful for Halloween pranks”.