Big D and Bubba Stunt: Gargling Hydrogen Peroxide Big D, of Big D and Bubba, has a thing for mouth cleanliness. He even goes as far as gargling with hydrogen peroxide. Back in 2013, he got the rest of the show to do it with him. Watch it above. Are there really any benefits to gargling with hydrogen peroxide, though? Yes, there is. Get our free mobile app If you head over to medicalnewstoday.com there is a list of several of the benefits of gargling with hydrogen peroxide. Whitening Teeth We've seen toothpaste on the shelves that advertise the use of hydrogen peroxide as an added whitening agent. Hydrogen peroxide is a bleaching agent so it can help erase some of those coffee or tea stains over time.