[SOLVED BY COMMENT] Why is the IntValue not changing to the player's health?

I'm creating a health bar in which every time the player's health changes, the bar would go down relative to the player's current health. I have two values in StarterGui.HealthBar. One is called MaxHealth and the other is CurrentHealth.

Here is my script: (LocalScript)

repeat wait() until game.Players.LocalPlayer.Character
local humanoid = game.Players.LocalPlayer.Character:FindFirstChild('Humanoid')

local maxHealth = script.Parent.MaxHealth
local currentHealth = script.Parent.CurrentHealth


local backgroundFrame = script.Parent.Main.BackgroundHealth
local realFrame = backgroundFrame.Health

currentHealth.Changed:Connect(function()
	realFrame:TweenSize(UDim2.new(currentHealth / maxHealth,0,1,0),'In','Sine',.2)
end)

However, the value of CurrentHealth is not changing according to the humanoid's health.

Any help?

EDIT: Thanks to PixelRankYT for solving the problem. Apparently the problem was that I didn't use Humanoid.Changed. I never knew that! :OO

humanoid.Changed:Connect(function() was actually the answer... I never knew that...

Thanks to PixelRankYT for answering!

(all credit goes to him, this answer is actually his)