I think you need to go back to the dentist with your night guard. I think you're correct
to wonder if the night guard is possibly causing those sore front teeth. If it is then the night guard can possibly be adjusted a bit.
I wear a night guard for tooth grinding, also. It's been adjusted a few times now.
Also, if you have dental work done, like a new crown placed, that changes the shape of your teeth in that area and you may need a new (different) mouth guard.
I fractured and lost two teeth before wearing my night guard. Don't be hasty in wanting
to get rid of it :-)
Thanks for the reply. I'll try see what I can do about the guard, but I might have to make do with the one I have :(. I am in Czech Republic right now and the dentist that gave me the guard is in Canada. I did wear my guard again last night and it seemed a bit better. I certainly don't want fractured teeth.