The punching script does not hurt the other player, what should I do?

So this localscript is supposed to throw a punch animation, and if the punch hit another player it should lose -10 health. The thing is that the animation works okay, but it does not give any damage on the other player. How can I fix this/improve my script?

local userInputService = game:GetService("UserInputService")

local PunchValue = false
local db = false
local leftPunch = script.LeftPunch
local rightPunch = script.RightPunch
wait(0.1)

local player = game.Players.LocalPlayer
local char = player.character
local hum = char.Humanoid
local leftHand = char.LeftHand
local rightHand = char.RightHand
local humanoidRootPart = char.HumanoidRootPart

local leftPunchTrack = hum:LoadAnimation(leftPunch)
local rightPunchTrack = hum:LoadAnimation(rightPunch)

userInputService.InputBegan:Connect(function(input, gameProcessedEvent)
    if input.KeyCode == Enum.KeyCode.F and db == false then
        db = true
        print("Player pressed down the F key")


        if PunchValue == false then
            PunchValue = true
            leftPunchTrack:Play()

        elseif PunchValue == true then
            rightPunchTrack:Play()
            PunchValue = false

            leftHand.Touched:connect(function(hit)

    print(hit)
    if hit == humanoidRootPart then
        local human = hit:FindFirstChild("Humanoid")
        human.Health = human.Health -10
    end
end)

rightHand.Touched:connect(function(hit)
    print(hit)
    if hit == humanoidRootPart then
        local human = hit:FindFirstChild("Humanoid")
        human.Health = human.Health -10
    end
end)                    
        end
        wait(1.5)
    db = false  
    end

end)

Thanks, Xsodar