Why does this only fire once?

I've got this server script:

game.Players.PlayerAdded:connect(function(player)
player.CharacterAdded:connect(function(char)
char.Torso.Changed:connect(function(look)
print(char.Torso.CFrame.lookVector) 
end)
end)
end)

It's supposed to return the lookvector of the player's torso when it changes, however this doesn't work after the first few times for whatever reason.

EDIT: Tried using a repeat:

game.Players.PlayerAdded:connect(function(player)
    player.CharacterAdded:connect(function(char)
        wait()
        repeat
            print(char.Head.CFrame.lookVector)  
            wait(0.1)
        until
        char.Head ~= nil
    end)
end)

Only fires once now for some reason.