Answers: Iced should stain less since you've contracted the tooth near the cold. Before current bleaching systems. we used to lay a hot instrument into the bleach to expend the enamel rods and allow the bleach in. cold would help out keep things tight. A straw is even better
i reckon its the same zilch changes the just difference is that it is cold. it'll still stain cause adjectives the ingredients are still there merely cold.