Filling came out together with half a tooth but still have a piece of tooth left is there harm living it like that?

Lost filling: If you leave the tooth like that, you will probably eventually lose the tooth. The fractured tooth is open to bacteria, decay formation, and infection. No pain does not mean no problems. Also, it's possible the tooth next to it or opposite it will shift into the empty space.

See a dentist: See a dentist and get the broken tooth treated. If you do not then you are facing pain and infection. It may not hurt you now but it will if it is not taken care of.

YES: Get in to see your Dentist quickly. You may break the rest of the tooth, get more decay, get infected nerve. Good luck.

See a dentist ASAP: Make sure you take care of the tooth and call your dentist before tooth gets infected. .

Yes: You have a damaged tooth, probably infected. Requires treatment. The longer you leave it alone, the greater theirs of bodily harm. Don't play Russian Roulette, see your Dentist before this becomes an emergency.