over the past week i have found three sets of teeth marks on dd2. dd1 is the only one who could've done it as we havent been visting anyone this week. How can i stop this happening? i'm fairly relaxed and as dd2 cant talk well enough to say ' bit me' i dont know when it happened and why. i dont go running at the smallest yelp from either of them, but i dont want dd2 to be used as a chew toy by her older sister.