Sova 1.6mm Mouth Guard for Clenching and Grinding Teeth at Night, Custom-Fit Sleep Night Guard with Case (SOVA3DN-CASE-E)

Are you able to trim this sova preformed night guard, do you need to do it before molding it to your teeth and after you put it in ice?

does it still work if you are missing lower front teeth?

Can I make the “preformed” one fit my lower teeth?

Confused about the difference between preformed and flat. The answers provided don’t offer much in the way of clarification. Preformed to what?