I have a bad experience with night guards and it seems to be something dentists like to prescribe unfortunately. I got one as I had pain in one tooth and it was due to grinding and closing my mouth hard in the nights.
Once I started with the night guard I got even more pain and after a month or two my tooth cracked and had to be repaired.
As there is even less space (as you have the plastic stuff between your teeth now) it seems you press even harder which damages the teeth even more. Maybe against light grinding movement it can help, but against pressing your teeth hard together at night it does definitely not help.
The best advice I got was to remind yourself at night when going to bed (and during the night when you notice it) to open your mouth a little (still with the lips closed) so that the teeth do not touch. It's a habit thing. I also noticed I grinded/pressed my jaws together more if I went to bed late.
Maybe the pressing the tongue against the palate and practicing proper tongue posture (so called mewing) isn't without merit. The force of the tongue counteracts the jaw muscles.
Once I started with the night guard I got even more pain and after a month or two my tooth cracked and had to be repaired.
As there is even less space (as you have the plastic stuff between your teeth now) it seems you press even harder which damages the teeth even more. Maybe against light grinding movement it can help, but against pressing your teeth hard together at night it does definitely not help.
The best advice I got was to remind yourself at night when going to bed (and during the night when you notice it) to open your mouth a little (still with the lips closed) so that the teeth do not touch. It's a habit thing. I also noticed I grinded/pressed my jaws together more if I went to bed late.