You're out of luck. The charge port is potted in place and I believe it would be fairly hard to replace it

​@dstvs I actually fixed mine 4 or so weeks ago. It was a bit of a pain, but I cut the wires from the plug (don't let the wires short). Held the housing lightly in the vise and carefully milled the epoxy away until it got to the metal part of the plug. (I do have a small hobby milling machine that I used to make it easier and more accurate, but it shouldn't be much harder with a dremel and small burring or milling bit. Just take small bits at a time) Once it was down to metal I could pry the old plug out a little bit then grab it with pliers. I bought a cheap pack of "USB Type C Female Pigtail Cables" off ebay. Had to cut away some of the plastic case around the new plug until it fit in the flosser housing (I used the milling machine again, because I was there, but it would be easy to do with a file). Once the new one fit I epoxied it in place. Once dry I cut the wires to the same length as the old ones. De-soldered the old wires from the board and soldered new ones in place. Has been working like new the last 4 to 6 charges since I fixed it. Now I just have to be more careful to dry it properly before putting it on charge so the port doesn't get corroded again.