How would I get this script to change operations when # of players on a team changes?

So I'm using this script to determine how many players on a team. It works fine, except I want the script to tell if the number of people on a team changes, and then reacts to that. Can someone please help me?

Here's the script

local team = game.Teams;

function getPlayers(teamColor)
    local found = { };
    for _,v in pairs(game.Players:GetPlayers()) do
        if v.TeamColor == teamColor then
            table.insert(found, v)
        end
    end
    return #found
end

while wait() do
    local greenNum = getPlayers(BrickColor.new('Bright green'))
    local redNum = getPlayers(BrickColor.new('Bright red'))
    if greenNum > 0 and redNum > 0 then
        print('Enough players')
    else
        print('Not enough players')
    end
end