Well I don't rinse my teeth with baking soda, but I do use it with my Colgate Total to get a squeaky clean feeling. I have a problem with producing to much plaque on my lower molars and front teeth.
I find that using the baking soda not only helps with the plaque but also helps heal and prevent some of my canker sores as well. I tend to bite the insides of my cheeks, and boy those canker sores are one nasty bit of hornery..
I don't know if it will help anyone else but for me it is a big help for reducing plaque built up on your teeth.