But we find people using them for months together, which is wrong.. If the smell persists even drying, then it is important to re-wash and dry it again.”While the thicker plastic bottles are stated to be reusable, experts say that the possibility of bad bacteria accumulating in case of not washing properly is always there. The National Test House in Kolkata had conducted test on plastic bottles storing milk, juice and also carbonated drinks in 2014 and it was found that there was a significant increase in heavy metals and phthalate leaching when the temperatures rose to 60 C. Nutritionist Rashmi Chaudhary said, "Plastics tend to absorb the smell of washing liquids and there are chances of residues remaining if it is not rinsed properly.Experts said it leads to fungal infections, ulcers, skin diseases, hypersensitivity, indigestion, and liver dysfunction.” Type of plastic 1) Polycarbonate with Bisphenol A used for making water bottles is found to cause impaired immune function, early onset of puberty, obesity, diabetes, and hyperactivity, among other problems according to research carried out by scientists for Environment California. Also, the bottles in which drinking water is packaged have very thin plastic and they are to be used and thrown.General physician Dr Hari Kishan said, "When there is a foul smell coming from the bottle it means that there is bacterial growth in it. It will also not accumulate any toxic chemicals. Using the same polyethylene terephthalate or plastic bottles for storing and drinking water for a year or more is injurious to health.” Experts say that even these bottles must be used only for six to eight months and then discarded.General physician Dr Nikhil Mathur said, "Too much use of plastic in everyday life for food, water, juices, carbonated drinks and then reusing these same bottles for storing of water is posing a health risk for the users. Immediate reuse of the washed bottle is not recommended as the residues can lead to contamination of water or the storing material.Using the same polyethylene terephthalate or plastic bottles for storing and drinking water for a year or more is injurious to health. But even if this process is followed, the life of the bottle will not be more than six months. They also smell bad, indicating bacteria growth. Plastic bottles that are used for a long time accumulate a layer of fungus at the bottom and on the sides.2) Polyethelyne is used in water bottles and storing of carbonated drinks, which is suspected by scientists to be carcinogenic. 2) 

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