I have a 7 yr. old Chihuahua named Chiquis, she has a loose tooth in the back of her mouth, I noticed that she would'nt close her mouth all the way. She must have chewed something that made it loose, I have 2 Chihuahua's the other is 4 yr. old and they both have good clean teeth. She is still eating fine, she don't look uncomfortable or anything its just she won't close her mouth all the way, any suggestions would be appreciated. Thnx