In my experience, my top ceramic screen can get clogged in as few as 5 bowls, but usually more like 10. Like @His_Highness highness said - poking the holes out with something pointy can increase your time between cleanings. Puffitup sells the replacement mouthpieces for $8.42 shipped in the US with their coupon code puffedup. I'm not sure how much cheaper they could be? I think having a second one on hand ready to go is justifiable if your Starry gets a lot of use. It's also nice to take an extra on trips/vacations.