In kitchen/restaurant, the crevice of ceramic tiles before the seam becomes white and black, which is very unsanitary and beautiful. The blackening of the crevice will breed bacteria, produce peculiar odor and seriously endanger human health. This kind of bacteria is especially evident in summer. DBOSS sealant adds negative oxygen ions, which is not only more environmentally friendly and healthy, but also odorless. It has luster, rich color, natural delicacy, smooth surface, easy to scrub, convenient to clean, waterproof and moisture-proof, which can avoid the harmful effects of mold breeding in crevices on human health.