OK so i imagine the birky wearing dentists on this forum bill so much $$$ they can afford to just thro them out after one wearing BUT if the stocks are in the tiolet so you need to deal with the breakdown of the cork try AQS
this pair is maybe 10 yrs old, used almost exclusively in the house, the places that birkys breakdown are around the edges of the sole and the sole cracks under the ball of the foot
you can see where i slathered AQS around the edges to fix the cork breaking down quite a while ago and I jammed some under the ball of the foot which you can't really see
you can buy a specific latex glue product from birky to slatehr on the sides of the cork when it breaks down, which looks nice as new but AQS works pretty good (this pict is of an old application ) and I think AQS would be better to fix the broken sole under the ball of the foot problem
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