When the toilet is installed, the hole of the toilet flange should be aligned. When the flange is placed onto the horn of the toilet the caulk makes a perfect seal.
Toilet flange repair, specifically the kind using a toilet flange extender, is pretty. Apply a generous bead of 100% silicone caulk on top of the old closet flange.
Install the wax ring and lower the toilet onto the flange. Stand on the toilet to compress the wax ring and ensure good contact with the caulk. Then use paper .