Very sore and bruised nipples

Hi all,

Just looking for a bit of reassurance that this is normal I guess...

DD is 5 months old and exclusively breastfeed through the day and night time with a couple of top up feeds in the evening.

Over the last few days she has been very distracted during feeds and keeps pulling off of the breast and my poor nipples are really sore, to the point that they are toe curlingly painful at initial latch like they were when she was born.

After let down happens it's fine and the rest of the feed is painless, just with the soreness when she pulls off of the breast. I have had a look in her mouth and there are no signs of thrush and I have no lumpy bits or symptoms of mastitis. She has recently acquired a couple of teeth on the bottom but they made no difference to her latch and she isn't biting or scratching me with them.

I guess I am wondering if this is a common thing? Could it be the upper teeth? (I can't see anything) Is there anything I can do about it?

Thanks all.