So on lower hazard levels the game can be pretty easy/slow which gives you plenty of opportunity to learn the ins and outs or to get a warmup mission in. However haz 3 always felt like a good sweet spot where it has challenges but even if you haven’t played in a week you aren’t gonna get toppled. I also wouldn’t consider DRG a game that you would ever need to “practice” to play other than maybe haz 5? But being able to play haz 5 is more about proper loadout and just knowing what to do.
Seriously please go to the dentist and take care of your teeth. My parents stopped taking me to the dentist when I was 16 and I didn’t return till I was 30. I had developed a massive anxiety over it and couldn’t even look at myself in the mirror because I was terrified to look into my mouth. I got off relatively lucky but for the love of God go to the dentist