Is there anything braces can't fix? After braces front teeth not straight. (photos)

I had my braces remove and get a retainer yesterday. I was quite shocked that my tooth (refer to the picture) didn't get straight as I hope . It look slightly pointed out . as my doc says because the size of my upper front teeth is too big and same in size . It can be fix by make it smaller by cut it a bit but it will make my face looks flat and older and my teeth will get sensitive . any suggestion and another good explaination about this? thank you

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