Tooth Brushing?

Have noticed some build up on some teeth on one ferret. No decay or anything yet but I'd like to clean it. 

I know they have the finger brushes for cats but this might be too big...

Any suggestions or product reccomendations?

We use what look like baby toothbrushes and CET enzymatic toothpaste.  I think Dar got the toothbrushes from a vet, but look online.  I wouldn't feel comfortable putting my big ol finger in a little ferret mouth. 
You can get the toothpaste online, but so far it's just as cheap at our vet.   

Something like this is all you need
http://www.amazon.com/Sunny-Hill-Dental-Grooming-Toothbrushes/dp/B00PG0WSXQ/ref=sr_1_11?s=pet-supplies&ie=UTF8&qid=1432937106&sr=1-11&keywords=small+toothbrush+for+cats

THE DOOKS OF HAZARD

One thing I might suggest is an electric baby toothbrush. My little Zaku is absolutely mesmerized by this and seems to enjoy the feeling. Sure he tries to chew on it but he doesn't try to take my finger off and wiggle away like he did with the finger and regular baby toothbrush.