My bf baby's 8m and has the front 4 teeth with the next two coming through at the top. He's bitten my nipple really painfully a few times, but this isn't my main concern at the moment, as I can usually predict when he will bite; but when he feeds he leaves really deep teeth marks with his top teeth. Does anyone have experience of introducing nipple shields this late in breast feeding or should I be working on improving our latch? Feeding's become so painful now 