Normal chewing results in brief intervals of contact between teeth. Under normal circumstances, your teeth should only contact for about 5 minutes each day. Slight amounts of wear over years of use is common.
Sometimes teeth develop a flattened, worn appearance. Digital X-rays may show unusually thin layers of enamel as if sandpaper has been drawn across the chewing surfaces of the teeth. Daily chewing shouldn’t erode the enamel so much.