Dental supplements / Chews

Is there a thread or any research that anyone has come across detailing effectiveness of dental products ?

Not just the usual dentastix type chews but various seaweed products such as Plaque off and I notice Logic do a chew that says it contains the enzymes like the toothpaste.

I know brushing is the number one option but looking for help while training teeth brushing.

No research comes immediately to mind. LUCAA + Spray looks a very interesting product.
How much iodine is safe for dogs?
LUCAA+ Pet Probiotic Dental Care.
RawSafe Tuesday night live: Dental Care.