Health bar not working? [SOLVED]

Hi, I was trying to make the health bar but somehow it seems that it is not working. Here is the code. I made a GUI and inside the GUI i inserted ImageLabel . Thank you for reading/helping.

H = script.Parent
P = script.Parent.Parent.Parent.Character.Humanoid

while true do
	wait()
if P.Health <=100 then
--Code removed due to problem has been fixed.
end

Pss. Others are like if P.Health <=95,90,85, Etc... Psss. The script does not make the image invisible nor visible. It just show the last animation.

Did you put in the correct id? For example, you forgot to subtract the id by 1.