Hello there!
Your answer would be brand extension
The reason why your answer would be "brand extension" is because Procter & gamble added this new product to their product line up that has nothing to do with what they usually produce. Procter & gamble is pretty much known for making things for the bathtub, or things that have to do with the laundry, and they kept that path for a while. But then, they decided to release teeth whitening products in their business, which would be known as a brand extension because they're extending their brand with items that come from a different industry. Teeth whitening has nothing to do with products for the bathtub or laundry. This is the reason why "brand extension" would be the correct answer.
