Living with your bestie can be a bit of a learning curve. Sure, you鈥檝e figured out how to decorate with a roommate whose tastes are a little edgier than yours. You鈥檝e compiled a list of healthy snacks to fit her 2018 meal plan, because hey, you鈥檙e supportive like that. And since you compromised on celebrating Martini Monday (her fave) and Wine Wednesday (yours), you鈥檝e packed all your best beauty products for a hangover. There鈥檚 only one thing left to figure out: Now that your worldly possessions are effectively doubling, what are you going to try on first? While it鈥檚 tempting to want to share everything with your bestie, according to the experts, there are a few items you should keep to yourself in order to avoid nasty health consequences.

1. Popcorn: Approach that family-sized bowl of snacks with caution. 鈥淪haring finger foods like popcorn from a communal bowl is safe as long as everyone washes their hands beforehand to prevent fecal contamination and GI viruses like rotavirus or hepatitis type A from spreading,鈥 says physician and medical researcher Dr. Briant Burke (developer of the HeelAid brush-on treatment for plantar fasciitis). Dr. Burke notes that even when you wash your hands, there鈥檚 still a risk of spreading colds and other respiratory viruses 鈥 but there鈥檚 no point in worrying about it. 鈥淭hat鈥檚 just part of being out of your house during winter,鈥 he says.

2. Towels: One of the easiest bathroom DIYs on a budget? Upgrading your towel situation. But you do need to change them regularly, especially if they鈥檙e in a high-traffic area. 鈥淚f you are using towels in the bathroom, be sure to wash [them],鈥 says Dr.聽Alison Mitzner, a board-certified pediatrician. 鈥淯se only the one for you, and [do] not share any of them.鈥 Dr. Mitzner also recommends switching to paper towels if someone in the family is feeling under the weather. 鈥淭he best way to prevent infection is hand washing and covering your mouth while coughing and sneezing,鈥 she says.

3. Lipstick: Your bestie tracked down the ultimate lipstick for dry, chapped lips, and now you鈥檙e ready to paint the town like RiRi. There鈥檚 just one problem: 鈥淕erms spread easily,鈥 says beauty chemist David Pollock, who has developed products for Lanc么me, L鈥橭real, Smashbox, and Bliss, in an interview with Brit + Co. 鈥淚f you have a favorite shade or want to help out a friend who insists on trying your newest find, use a tissue and wipe it off first in an attempt to remove the used layer and reveal fresh, new product.鈥 Or, if you鈥檙e not comfortable wiping away precious lipstick, twist the tube all the way up and load a lip brush with color from the base.

4. A Glass of Wine: Urban legend has it that booze is safe to share, since alcohol kills germs. True or false? Both, as it turns out. While the alcohol content in wine is relatively low, and therefore unlikely to slay a virus, you won鈥檛 necessarily pass something along if you share a glass. 鈥淭he risk of disease transmission from sharing personal items varies, depending on the item and the disease,鈥 says HeelAid developer and physician Dr. Briant Burke. Still, if you鈥檇 rather be on the safe side, get your own glass. 鈥淚t seems obvious to not share food and drinks,鈥 says Mitzner, 鈥渁lthough often it is hard to remember this when you are in a social setting.鈥

5. Mascara: We鈥檝e all heard that sharing eye makeup is a no-no, but let鈥檚 face it: Even our drugstore faves don鈥檛 come cheap. Still, if your roommate offers up her collection to help with your hunt for the best mascara, resist the urge to test-drive. 鈥淢ascara tubes provide the perfect environment for bacteria and fungus to form, infecting and re-infecting your eyes with each use,鈥 says Pollock. He warns that conjunctivitis, or pinkeye 鈥 a highly contagious viral infection 鈥 can go unnoticed in one person and cause huge problems for another. 鈥淭his makes sharing eye makeup a big concern,鈥 he warns.

6. Nail Clippers: 鈥淢ore than 60 percent of the world鈥檚 population has some form of nail infection caused by mold, yeast, or fungus,鈥 says Dr. Mark Hinkes, a board-certified podiatrist. These infections can cause the nails to be affected by bacteria. 鈥淪o, the likelihood of transferring the infection via use of an unsterilized instrument is fairly high.鈥 Dr. Hinkes says that even wiping down your nail clippers with a topical disinfectant doesn鈥檛 guarantee cleanliness 鈥 that鈥檚 why an autoclave is a pedicure essential among trusted nail-industry pros.

What items do you hate to share? Tell us about it @BritandCo!

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