Toddler chewing on things?

My son who is a year old is chewing on things and I'm afraid he's going to cut his gums or chip a tooth. He bites on plastic or when he's in the tub he'll try to bite into the soap holder. He also tries to take the lids off of his sippy cup by using his teeth. I'm pretty sure this is normal behavior, but I don't want him to hurt himself by biting hard into something that would hurt him. How can I get him to stop? He still uses the pacifier, but not often (I'm trying to ween him), should I give it to him more often until he's a little older?