How to fire a function only if a value is lower than before?

health:GetPropertyChangedSignal("Value"):Connect(function()
        local currenttxt = "You have been hit! Use a bandage to restore health!"
        local newHint = game.ReplicatedStorage.GUIs.HintLine:Clone()
        newHint.Parent = player.PlayerGui.Main.Hint
        for i = 1,#currenttxt do
            newHint.Text = string.sub(currenttxt,1,i)
            wait(0.05)
        end

end)

How can I make this happen only if the player's health drops, and not increases?

local formerhealth = {}

table.insert(formerhealth,1,health)
health:GetPropertyChangedSignal("Value"):Connect(function()
	if health < formerhealth[1] then
		table.remove(formerhealth,1)
		table.insert(formerhealth,1,health)
		-- do whatever you need to do now
	end
end)