How to tell that your iphone 5s dock connecter is broken?

My iPhone 5s has been charging fine since yesterday but when I went to charger it i doesn't work tried turning it on and off, reset it, even factory reset on iphone setting because not even Itunes could even connect/recognize it, so i think its broken how to you tell? I have trying to clean out lint but i see like bend stuff but i don't really know since its a black iphone and my moms iphone is white which i can see clearly… How can i really know its broken?!>?/

The only way to tell for sure would be to take it somewhere (Apple retailer or Authorized repair shop) and have them look at it.
Try using a different charger, but still an actual Apple charger.
My phone was touchy with charging. Had to have something pressing against the charger to make it connect or wiggle the charger back and forth a little to get it to connect. But I used a different charger and now it works fine.
If another charger doesn't work, see if you still have a warranty and try getting it repaired that way.

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