Very good80/100
White teeth, a winning smile – who wouldn’t want that? But then there’s that yellowish tinge that spoils it all. At-home teeth-whitening kits are supposed to solve the problem. But can they really lighten discoloured teeth and finally make a dark smile shine? Stiftung Warentest has tested 13 at-home teeth-whitening products in the lab – including serums, gels and whitening strips...