Tailwind is an Pinterest Partner tool, and as such we are prohibited from deleting Pins you schedule to your Boards.
There’s no need to worry about duplicate Pins, however. Generally, deleting pins, even duplicates, isn't something we or Pinterest would recommend! Most Pinners are searching Pinterest for ideas, not browsing your Boards. Here’s what Pinterest’s Product Marketing Manager told us:
Basically, one dud Pin may not get distribution, but it will NOT hurt the performance of your other Pins. Further, a Pin can take weeks or months to take off and start driving traffic, so do not delete Pins.
Note: When you are adding Pins to a SmartLoop, should you accidentally add a Pin more than once, we WILL delete duplicates before completing Loop setup.