Went to the vet
I took Cooper into the vet on Saturday about his gums and tumors as well.
I was told by the vet that this sort of thing happens to the flat faced breeds or those breeds with an under-bite. The reason being is because of their jowls, some boxers have tight jowls and others have loose and this can also determine how much one drools or slobbers. It is the loose jowled dogs that are more prone to getting this because of the bacteria build up they have in their mouth due to the drooling and slobbering instead of swallowing, it kind of makes sense to me.
She told me that his are not bad enough for surgery at this time and to check back in 6 months and we will check them again. In the meantime she told me to buy some listerine (the new kind.... citrus) because it is not as potient and he may take to it better but while he was sleeping to dip a Q-tip in the listerine and swab his gum line to help reduce the bacteria that builds up, she advised to do that as many times a day if permitted especially after meals. Then there is a enzyme toothpaste you can use as well, brush the teeth and then you can leave the paste in his mouth and this too will help reduce the bacteria, there are also some enzyme chews you can pick up at the vets that will do the same thing. So I bought the paste, the chews and the citrus listerine, he likes the chews and loves the listerine:D I am going to keep doing this as often as I can and see if it works. She said that his breath will improve when you kill the bacteria on a regular basis. I guess we have nothing to loose and fresh breath to gain:p