Trigger fish mouth getting smaller?

Western_reefer

Reef keeper
Ever since I got my Niger Trigger, his mouth has been getting smaller and smaller. I got him when he was 2 inches or so and now hes id say about 3-4 inches and his mouth is really small. Anyone know why?
 
Here are a few pictures of the Niger Trigger. Does his mouth look normal and all? Just want to make sure. :)
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Flash.
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I'm starting to get really worried about him, he has gotten much thinner and isn't eating as much as he used to. :( Do you need snails/shrimp with shells and all to help trim their teeth? Or Niger Triggers teeth don't grow like the puffers?
 
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