Sally,

Sally,
You used the plural term "trays" (as in upper and lower).

I am a bruxer, have had ortho treatment, and wear upper and lower "trays" (called an Essix retainer).

This set up works very well for me.

If the way your teeth come together when wearing your appliances isn't in harmony with your jaw joint (for example, if one area touches before any other as you close your teeth together), it may cause you to brux more.

As a start -
Ask your dentist to check for "prematurities" when you close and to "equilibrate" the appliances (trim/adjust) so to remove them.

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