Got my cavities filled. can it make my jaw loose or weak in anyway?? i sometime feel like upper jaw drops on d lower when i talk. why is it? m scared.

Transient Anxiety: Based on the information provided, I would suspect anxiety. Sometimes transient anxiety can be a side effect of certain medications or dental procedures. The bones of the upper jaw are firmly attached to the skull, so that they are quite incapable of any independent motion.

Jaw loose?: Have your dentist check your bite. It's possible the fillings are too high and need to be adjusted.