Roo has got a good one but I think it was just a random pet shop one.
Its a special teething style one and has these rubber cogs with rubbery bristles on and I put either kong paste or peanut butter around the cogs and he sits their munching for ages! Will have a look on internet or try to get a photo for you, its green and white and cleans his teeth well!
Edit: can't find it at the moment but Roo had one of these and I used to put paste into the cracks, he liked it:
http://www.petsathome.com/shop/kong-...g-sticks-13521
Edit2 : was similar to this one in that the cog things can be moved about and clean the teeth at the same time, again I put paste like peanut butter into it and he loves it!
http://www.petsathome.com/shop/doubl...nylabone-13555
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