Does somebody else think science diet cause bad breath?

We recently switched from natural choice dry food for puppies to science diet and noticed a chance in her breath. it obvious that the cause is science diet by smelling the bag and food itself. has anyone else noticed this? anyone have any opinions about natural choice dry food for pups? oh, i do give her canned food mixed in.
Answer
What you will notice if you read the ingredients is that science diet is mostly corn - not meat. this is not good food for puppies or dogs - the first ingredient on the food should be meat - not corn or grain. switch to better food for your dog - canidae is extremely good , or something of that quality.