Default health not regenerating?

So I gave up on the custom health gui and just decided to stick with the default one roblox gives you and whenever I play in studio it gives my character a script called "Health" which contains this

-- Gradually regenerates the Humanoid's Health over time.

local REGEN_RATE = 1/100 -- Regenerate this fraction of MaxHealth per second.
local REGEN_STEP = 1 -- Wait this long between each regeneration step.

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local Character = script.Parent
local Humanoid = Character:WaitForChild'Humanoid'

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while true do
	while Humanoid.Health < Humanoid.MaxHealth do
		local dt = wait(REGEN_STEP)
		local dh = dt*REGEN_RATE*Humanoid.MaxHealth
		Humanoid.Health = math.min(Humanoid.Health + dh, Humanoid.MaxHealth)
	end
	Humanoid.HealthChanged:Wait()
end

I have made no changes to this yet the health still wont regenerate when I get hurt i've been trying to fix this for hours help