How do you make this health bar decrease it's size as the value goes down of a number value?

I'm making a card game and I'm trying to add a health to the card. Here's the script;

local healthbar = script.Parent.Parent:WaitForChild("HealthBar")
local currenthealth = script.Parent:WaitForChild("CurrentHealth")
local maxhealth = script.Parent:WaitForChild("MaxHealth")
local cardlevel = script.Parent.Parent.Parent.CardLevel:WaitForChild("CardLv")
local cardhealthtext = script.Parent

while true do
	wait(0.1)
	cardhealthtext.Text = currenthealth.Value.." / "..maxhealth.Value
	if cardlevel.Value > 1 then
		maxhealth.Value = maxhealth.Value + (cardlevel.Value * 2)
		local Health = currenthealth.Value / maxhealth.Value
		healthbar.Size = UDim2.new(Health, 0, 1, 0)
	end 
end

There was no errors but the health bar won't change sizes, Please help