Sometimes my upper teeths go left and bottom teeths go right. that's how it feels. scrap over each other. it's brief like a second. started 2 months a?

See your dentist: The condyle of the lower jaw to move in multiple directions and sometimes interfering with your bite. See your dentist for a selective occlusal adjustment.

Could be TMJ/TMD: Your teeth, muscles and the jaw joints form a triad of function that often determines health or issues. If one is off, it can affect all three. Should see a dentist/TMJ specialist to evaluate. Could be grinding and/or clenching