My Sophie is 4 months and still has one button ear that is creeping up in millimeteres. She can make them stand up when she wants though but the one tips when she is relaxing.It gets a little higher each week
I don't think there is any correlation between teething and ears flopping over. Only that they both happen during the puppy stage. I think the ears just have a mind of their own. Floppy one week...one up the next week....floppy the next...they just come up whenever they feel like it!!!