HOW LONG DO DENTAL FILLINGS LAST, AND CAN THEY CAUSE PROBLEMS?

I got whatever dental fillings for cavities 4-5 months ago. I conceive I change them correct after the activeness but within maybe a pair of life I didn’t see anything, and I don’t conceive I see whatever disagreement now. I also periodically intend discompose where digit of the fillings were – I’d see whatever discompose for a some life and then it disappears for a period or so. Does that stingy I requirement to intend it patterned again and mayhap refilled?