We are living in some of the common items are to be replaced every so often, although it will increase spending on the economy, but also necessary, after all, the issue of health risks can not stay. 
           Plastic products a year for a change. Lightweight unbreakable plastic products, can be seen everywhere on the table. But they soon extended service, most likely to become brittle, aging, small molecules easily precipitate harmful to become induced cancer risk of molecules. If you find that there is scratched plastic cutlery, originally smooth surface becomes rough, or have pungent "plastic taste", then even with less than a year, it should be replaced. 
           Metal products coating detrimental to have to change. Many people think of metal products safe to be used for life, does not. Wok with the most common example, wok surface to protect its stainless "cooking oil layer" Once off, the pot of rust easily cause nausea, vomiting, diarrhea, poor appetite and so on. 
           Enamel prone to cracks in the enamel-coated aluminum and other products outside of the material, will take the opportunity to transfer to the food to go. Stainless steel is the incorporation of iron-chromium alloy nickel, molybdenum and other metals made ​​of these metals are also harmful ingredients. So, when there was found kitchenware made ​​of metal scratched, surface phenomena such as paint or coating off, it should be replaced. 
           Ceramics cracks that change. Pretty porcelain glaze contains lead, when cracks, lead may overflow, mixed into food. Therefore, with the crack of ceramic tableware will not continue to use. Tableware and maintenance of life are inseparable. For ceramics, metal and other bicycle through careful maintenance we can extend its life, but once there has been broken, deformed, off porcelain and other phenomena also should be replaced, not for the moment "saved" in vain "waste" out precious lives.