Can a composite filling in my tooth fall out?

Yes.: Any filling can fall out. The main reason for losing a filling is recrrent decay around the filling loosening it and causing it to fall out when it is no longer held in securely by healthy tooth structure. Tooth fracture is another reason this can occur. Small restorations on the biting edges of teeth are also vulnerable since there is little tooth holding the restoration in place.

Yes: If it cracks, any restoration can appear to, "fall out." a filling can crack because a new cavity under the filling weakens it, leaving it unsupported. If it is a new filling, and it feels a bit too tall, it can crack.

Yes-but unlikely: A properly placed composite filling is chemically bonded to the tooth, so it is very unlikely for one to simply fall out. More often a portion of a composite will crack and break out. For an entire composite filling to fall out, a significant problem occurred when the filling was originally placed. Placement of composites is very tedious, and a strict protocol must be followed to properly place.

Yes: Sure. All depends on load, bond strength, how much tooth there is to support it, and if there is decay around/under it. If done well and well cared for , then should last a long time.