Eventually the ear breaks free. Remove the glue. Usually I can comb it out, but sometimes I cut it out. And then put the ear back down again. Be sure to continue this process until your pup has finished teething.
Ears do funny things while teething.
Then just look at the ears when they come loose and see how they look. If they look good and don't start losing form in a few days, you are done. If they start losing form, glue them back down. Usually by no later than 7 months you will be done. As far as traumatic, my dogs pawed at them the first day and then forgot about them.