What are these dents/ridges above my eyebrows? (photo)

Thank you for submitting your question.  The dents above your eyebrows that make ypu look angry are the corrugator muscles.  Botox will smooth out the muscle and help the "angry" appearance.  Consult with a board certified injector.  Best Wishes. 

These are not  dents, but simply depressions  from activating some of the muscles used to squint.  See  a plastic surgeon and most likely a little Botox placed properly will reduce the condition.