Fortunately, there is an effective treatment for gums in this condition.  It appears that the extreme plaque buildup has contributed to the condition of the gums. 

My other dog is four years old (this one is five) and has experienced no new plaque build up as a result of having Pet-GaardTM added to his drinking water for the past two years. 

Left side showing condition of gums at different times during treatment.  Note the extreme inflammation and redness in the early photos.  The condition of the gums continues to improve.  Daily treatment with a teaspoon of milk added to a half ounce of Pet-GaardTM will continue until the gums appear normal (probably for another 20 to 30 days).  I'm sure progress would be faster if I could teach the dog how to gargle.

Left side after two days of treatment.

Left side after five days of treatment.

Left side after thirty days of treatment.

Right side showing condition of gums at different times during treatment. 

Right side after two days of treatment

Right side after five days of treatment

Right side after thirty days of treatment