Game ignores modified health script?

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

local REGEN_RATE = script.Parent:WaitForChild("PerCycle").Value/100 -- Regenerate this fraction of MaxHealth per second.
local REGEN_STEP = script.Parent:WaitForChild("RegenCD").Value -- 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

The values do change properly but it remains the same even after the change