Mine get RedBarn ChewyBulls - totally digestable - or other dental type chews (never rawhides - I found a 3 inch stick of rawhide in their poop - never understood how it got through without doing damage - never again).
They also have Nyla bones (until the edges get too sharp) and occasionally bully sticks (fat ones only) or regular marrow bones (thick cut).
I used to use antlers until a friend's dog broke several teeth on antler.
@giza1 Joanne, is there a specific Nylabone that works? I've never had a dog who likes them. (shocking, right?)
We usually get the bigish ones, there is such a selection of Nylabones now. If your dog doesn't like them at first, try boiling it up in some sort of stock, infuse a little flavour.