Base health isnt updating?

[hybrid sedge]

local Players = game:GetService("Players")


local blackcolor = Color3.new(0, 0, 0)
local health = {}

function health.Setup(model)
    local newHealthBar = script.HealthGui:Clone()
    newHealthBar.Adornee = model:WaitForChild("Head")
    newHealthBar.Parent = Players.LocalPlayer.PlayerGui
    
    if model.Name == "Base" then
        newHealthBar.MaxDistance = 100
        newHealthBar.Size = UDim2.new(0, 200, 0, 20)
    else
        newHealthBar.MaxDistance = 30
        newHealthBar.Size = UDim2.new(0, 100, 0, 20)
        newHealthBar.Title.TextColor3 = blackcolor
    end
    
    health.UpdateHealth(newHealthBar, model)
    
    model.Humanoid.HealthChanged:Connect(function()
        health.UpdateHealth(newHealthBar, model)
    end)
end

function health.UpdateHealth(gui, model)
    local humanoid = model:WaitForChild("Humanoid")
    
    if humanoid and gui then
        local percent = humanoid.Health / humanoid.MaxHealth
        gui.CurrentHealth.Size = UDim2.new(percent, 0, 1, 0)
    
        if humanoid.Health <= 0 then
            gui.Title.Text = model.Name .. ": Dead"
        else
            gui.Title.Text = model.Name .. " : " .. humanoid.Health .. "/" .. humanoid.MaxHealth
        end
    end
end

return health

Im making a tower defense game and this is supposde to be the script for the health of the base. It doesnt update when an enemy walks into the base and i dont know why. The output doesnt give me any errors. and im just stumped please help. if you need more info about this just ask