Answer:
To stay healthy in winter, I would follow all the instruction that the doctor gave me, eat the heathy foods, sleep well, take a bath everyday which helps us to stay neat and clean, use hand sanitizer every time before eating, I will not share my foods and water with anyone because if I do that it maybe cause a problem because if someone have a problem and it's infectious, I will get it too. So, to stay safe we need to follow the instructions.
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Yes, because it could get infected and would continuously produce pain, which will annoy you and maybe make you lose focus of what you are doing. Hope this helps!