The xray would show a blockage as it does show feces.
Yes, dental pain can cause a cat to stop eating, but normally they would be drooling too.
What are you feeding your cat? I highly recommend Kitten Wellness, canned, it is an excellent, palatable food that is easy for your kitten to digest.
http://www.wellnesspetfood.com/produ...?pet=cat&pid=1.
And since you are a new kitty owner, here is about the best website for nutritional info on your cat. Please take the time to go through it, it is amazing what you will learn  .
http://www.catinfo.org/
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Cat maid to:
Rose semi feral, a cpietra rescue, female tabby (approx 13 yrs)
Jasper RIP (2001-2018)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey
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