I don't know what the situation is in the US but, here in the UK, we are bombarded with ads for products that claim to prevent or treat gum disease.

Of course, since I suffered from gum disease in my youth, I know the only way to eradicate it is mechanically, in the dentist's chair. The process removes a layer of gum tissue which will not grow back which then means you are much more susceptible to the problem recurring. Extensive oral hygiene thus becomes a way of life.

Regardless of any link with alzheimer's, I would urge anyone to avoid having to go through this and, if you have bleeding gums, go and see a dental professional as soon as possible - expensive mouthwash may mask the problem for a while but it certainly won't cure it.