What does it mean when a guy licks his teeth when he sees me?

Anonymous
There is this guy who I like and I think he likes me but lately he does something funny, I am not sure if he knows he is doing it. He licks his teeth when we have a conversation and when it's my turn and I am speaking. I keep wondering why is he doing it, does it mean something? Do you guys know anything about this type of body language behavior?
What does it mean when a guy licks his teeth when he sees me?
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