Why is my Humanoid not losing health every 2 seconds like the code describes?

So, I am trying to make a script so that every second the player touches the part specified, it loses 10 health. But every time I try the code, it only seems to do it once. I don't know what's going on, if it's all the if/repeat/while commands, but it only does it once. Please help?

function onTouch(part)

local humanoid = part.Parent:FindFirstChild("Humanoid")

local x = 100

while (humanoid ~= nil) do

repeat -- basically repeat

humanoid.Health = (x - 10) -- damage the humanoid

wait(2.0) -- wait time for another damage count

until( x == 0 ) -- the condition that the code must be in for the repeat to stop

end

end

script.Parent.Touched:connect(onTouch)

I don't know what's going on. Sorry for having such an unorganized script, I'm new.