There could be something in your teeth or he could think you have a beautiful smile. If he says it kinda sarcastically then you should probably check your teeth in the mirror.
it means the thinks your pretty and cute, hes flirting with you.
It could mean the girl finds him to be caring, and could even like him.
He likes your smile / he hates seeing you sad
When a guy tells you that your smile is a turn-on, especially if he likes you, he's expressing attraction and appreciation for your positive energy. It suggests that he finds you physically appealing and enjoys the way your smile lights up your face, which can create a sense of connection. This compliment often indicates that he feels comfortable around you and is interested in pursuing something more than just friendship.
It does not necessarily mean anything - he may not be interested in your smiling.
Say you love them back, or if you don't, just smile or kiss the or something.
It means he's nice, don't look to into it.
he wants you
act nice and smile.
If a guy tells his friends that his girlfriend is quality, he means that she is a great girlfriend.
When a guy tells you he feels a pit in his chest, he means that he has a chest pain.
or wants to be a good friend