mouthing and chewing

Sounds like the title of this post should be about Zane....but no...it's about Gabe. He is getting worse with mouthing things. We saw a decrease in his desire to put everything in his mouth, but the past month or so it's getting really bad again. I have tried his wiggle toys, chewy foods, sour foods, spicy foods, etc to "wake" up that mouth of his. So far today I have found a paint brush, a car, some paper, and his fingers in his mouth. I feel like all I say anymore is "please not in your mouth Gabe" I wonder how many non edible items my son has eaten in his 4 years of life?