If you're OK with leaving "kitty toys" around the house, try some bendy straws. We use those while kitties are teething - but our cat that gets plaque build-up likes to chew on things, and she loves those straws even now that she's "grown up." We get her plaque scraped at the dentist every year even though she LOVES having her teeth brushed (once she got used to it and figured out how great it apparently feels). For whatever reason, she just gets plaque build-up really fast.
But as to discouraging kitty from chewing things she shouldn't be - bitter apple is a good recommendation. But if she chews on curtains or whatever, you should consider a citrus spray. It makes the house smell nice and cats HATE it. Cord wrappers are good - but they need the bitter apple too.
We have a "paper tearer" in our midst. We leave paper bags around the house for her to play in, on, and "eat." It means vaccuuming with a hand vac ALL THE TIME, but the shreds of paper bag everywhere are much better than shredded mail, mags and books!