coined by Gavin Free of Rooster Teeth, the toothpaste rule states that it only takes one day to get used to change.
Person 1: My new toothpaste tastes weird.
Person 2: Oh don't worry, it'll taste fine tomorrow.
Person 1: What?
Person 2: It's the toothpaste rule.
Person 1: What's that?
Person 2: It only takes one day to get used to a change. So tomorrow your toothpaste will taste fine. The Toothpaste Rule