Girls, we've had them for four months, they grab things in their hands…

Girls, we've had them for four months, they grab things in their hands and put them in their mouths, there's a lot of saliva, they get fussy, but the gums aren't swollen, and there are no other symptoms on the teeth when you check with a spoon, there's a click from the bottom when they bite toys or chew on something, they get angry and cry. Are these teeth? Should I apply ointment to the gums?