Face won't switch back to happy

Try this:

local Head = script.Parent.Head

while task.wait(0.5) do
	for i, v in pairs(workspace:GetPartsInPart(Head.SadnessHitbox)) do
		if v.Name == "Left Leg" or v.Name == "Right Leg" then
			Head.face.Texture = "http://www.roblox.com/asset/?id=910076130"
			break
		else
			Head.face.Texture = "rbxasset://textures/face.png" 
		end
	end 
end