How to fix this? i'm making custom overhead health GUI

The Code In StarterCharacterScript -

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1 local char = script.Parent 2 char.Changed:connect(function() 3 print("ads") 4 local hum = char.Humanoid 5 local health = hum.Health 6 local maxHealth = hum.MaxHealth 7 char.Head.HealthBar.GreenBar.Size = UDim2.new(health/maxHealth,0,1,0) 8 end)

Also the Billboard GUI is in the characters head

Problem -

Whenever the humanoid takes damage the green bar wont scale to its health.

Also its a billboard GUI in the players head