I think that the data Ukraine has on Russian losses is better than in any previous conflict. The drones are constantly flying over the battlefield recording.
I also think that Ukraine has significant political reasons for attempting to be reasonably accurate. They rely on NATO for money, weapons, and supplies. They need to provide an reasonably accurate representation of what they are doing with the resources to keep their suppliers happy.
It doesn’t need to be exact, just a reasonable estimate made in good faith.
This was especially true with the old metal based fillings (gold, silver, etc). The metal contracts and expands a miniscule amount with heat and cold. Eventually they end up cracking the tooth. The larger the filling, the worse it is.
I am on crown #5 because of that asshole dentist when I was 23. Oh and a nice plus is they were extremely sensitive to temperature and randomly hurt like hell. At $1000 per crown it’s not fun on the pocket book.