Disposable lunch box: shelf life of about 4 months, not suitable for high-temperature food, generally can not be put in the microwave oven heating, because its main raw material is polystyrene, at 65 degrees above the high temperature will cause dioxins, has been proved to be carcinogenic substances.

　　Disposable tablecloth: shelf life of 6 months, due to the release of sulfur dioxide in the natural environment, should not be placed on the table for a long time, if you must use, it is recommended to use again spread, used up timely recovery.

　　Disposable toothbrushes: the disposable toothbrushes used in hotels are mostly sealed, and the shelf life is about 8 months.

　　Disposable comb: the shelf life of about one year, mostly plastic products, not only easy to friction with hair and scalp to produce static electricity, the release of sulfur dioxide and other toxic substances are also easy to lead to dandruff, dermatitis and other occurrences.

　　Disposable paper towels: most of them are directly packed after the original roll paper is cut, and they are prone to chemical changes when exposed to air. It is recommended that they be used up within two days after opening.

　　Disposable masks: one-year shelf life, expired not only can not play a role in isolating bacteria, but also may be due to material deterioration released erosion of respiratory mucosa substances, causing asthma.

　　Disposable underwear: mostly chemical fiber products, shelf life for one year, after the expiration if not washed, disinfection treatment, easy to lead to dermatitis, urinary diseases.