Nobody wants to have discolored teeth, and Americans are more than willing to pay for the whitest teeth possible, spending some $1.4 billion on home teeth whitening products each year. What about if you want to have a whiter smile, even if those teeth aren't technically your own? Dentures can become discolored, just like natural teeth, but surely whitening your dentures isn't going to be too complicated? Rigorous Cleaning You might think that because your dentures are designed to be durable and robust, this means they'll be able to withstand some rather rigorous cleaning methods and products.