“…Exogenous niduses can be composed of different materials, such as cotton, cellulose [5], paper [6], snuff [7], dental burs [8], dental implants [9], GP points, and silver points [10]. More bizarre foreign bodies include bullets [11], pieces of glass, stones [12], wood [13], grasses, match sticks [14], sand [15], and a living leech [16]. There are reports of root canal overfilling to the maxillary sinus causing sinusitis [17].…”