How do I make sounds play when a player reaches to that certain hp?

How do I make sounds play when the player reaches to the certain hp? doing While True do works but rapidly plays the sound which I don't want at all. I'm stuck and I want to get some help to help me solve this solution.

local player = game.Players.LocalPlayer
local Character = player.Character or player.CharacterAdded:Wait()
local s = Character:WaitForChild("Humanoid")

wait()
if s.Health <= 40 then
    end
    -- Sound Play
    script.Parent.Sound:Play()
    script.Parent.Sound2:Stop()
    if s.Health >= 50 then
        -- Sound Stop
    script.Parent.Sound:Stop()
    script.Parent.Sound2:Play()
    end