Girls good evening, we're 3 months old, we can't pull our fingers out …

Girls good evening, we're 3 months old, we can't pull our fingers out of their mouths, they bite them, saliva flows like a river, she also sucks on her lower lip and sticks out her tongue ? gave him a teething ring for teeth, he bites it too, does that mean the teeth are sticking out? The gums aren't swollen yet, and it behaves calmly so far.