What is the full model number of the laptop as shown on the product label on the bottom of the laptop?
Is it the lid or the base enclosure that is bent or damaged?
Are the lid hinges loose or bent?
Post an image in your question that shows the "dent in back" so that people can better understand what it looks like and what impact it may have on the lid opening.
1 
Hi,
What is the full model number of the laptop as shown on the product label on the bottom of the laptop?
Is it the lid or the base enclosure that is bent or damaged?
Are the lid hinges loose or bent?
Post an image in your question that shows the "dent in back" so that people can better understand what it looks like and what impact it may have on the lid opening.
Here's how to 在已经存在的问题里加入图片 in ifixit
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