Dental chews can be helpful, especially for dogs. Cats generally are not too interested in chews, although there are some available. With any chews you should take care that they are not too rich - some dogs can get upset tummies if they have chews too frequently. We do not recommend that dogs chew on bones - cooked bones are especially prone to splintering and causing damage to the gut. Even raw bones can cause gut problems and, although they tend to keep tartar off the teeth, they can chip the enamel and cause dental fractures.
Finally, remember that all chews contain calories so you may need to reduce the amount of food you are giving to avoid your pet gaining weight.