One of my molars was almost all filling on the top, so a crown was required. Instead of ordering out, the dentist just did a 3d scan of my teeth and made me a new tooth while I sat enthralled, staring at the machine next to my chair like a 5 year old boy watching a construction site… or like a nerd watching a cnc mill carve a tooth out of ceramic.
I now have a brand-new tooth topper and I can’t tell it apart from the teeth I made myself (though it took me more like forty years to make mine).