It can be from baby teeth or it can be from tarter build up in the back teeth from feeding alot of can food or soft food.
How old is she? Give her plenty of things to chew on such as Greenies to help the baby teeth out and the greenies also freshen breath.
Vet Tech for 16yrs, I love my pets more than most people.
Also Mom to : Mitzi Sue ( Shihtzu) and Pebbles ( Yorkie) Pebbles was put to sleep 20 days before her 20th birthday
Rest in peace my love Roscoe ( Congo African Grey) and Nemo ( White Belly Caique) Cheeto ( Red Rump Grasskeet)Jazz ( White Cap Pionus)