When was the filling done? Did it feel odd immediately after the procedure or did the feeling develop later? Are you experiencing pain while biting or soreness in your jaw muscles?
One possible reason is a high point in the filling, meaning it is slightly too high and touches the opposite tooth before the other teeth meet properly. This can put extra pressure on that tooth while biting.
Next Steps
Visit a nearby dentist soon. They can check your bite and adjust the filling if needed. An X-ray may also be advised to assess the tooth, depending on the clinical findings.
Health Tips
Please get it checked as soon as possible, especially if biting feels uncomfortable. Avoid chewing hard foods on that side until then. If your jaw muscles feel sore, gentle warm saline rinses may provide some comfort, but they won't correct a high filling.