15 bad hygiene habits that are way worse than you thought

For most people, good personal hygiene is just a way of life – though everyone skips a shower, forgets to floss, or sleeps in sheets that are overdue for a good washing. How bad could it be? We asked the experts – and the truth may shock you.

What would happen if you abandoned your toothbrush and dental floss? “You would first experience swollen, bleeding gums, bad breath, and [you] may develop cavities,” says dentist Natasha Lee. Untreated cavities would travel to the nerve, requiring root canals, and debris in your mouth would lead to gum disease, a painless condition that eventually causes your teeth to fall out.

And it gets worse. “There is a growing amount of research that indicates an association between gum disease and other health problems like heart disease and diabetes,” notes Lee.

Watch out for these 12 common teeth-cleaning mistakes that make dentists cringe.

“Personal hygiene serves a more important purpose than just keeping body odour at bay,” says skin care expert Janine Frances. It’s not just gross, in other words: Soap and water can prevent acne, rashes and life-threatening infections. “Bacteria grows rapidly on the body, and when it has lots of dead skin cells to feed off of, bacteria on your skin can cause itching, irritation and inflammation,” says Frances. “If you already have a skin condition, such as eczema, not showering regularly can make it worse.”

Eventually, a condition called dermatitis neglecta would set in if you stop showering completely, says Frances. You’ll notice thick patches of brown plaque on the skin, and they can lead to secondary infections. Luckily, dermatitis neglecta is usually treatable with regular washing. In severe cases, topical medication might be needed to break down the plaque.

Here are 8 ways you’re probably showering wrong.

At the end of a long, exhausting day, it might be tempting to nod off without washing off your makeup. Any makeup artist or skin care professional will tell you this is one of the most egregious hygiene mistakes you can make. “Not washing your face daily can create clogged pores which can not only lead to blackheads and pimples but uneven skin colour due to overgrowth of skin cells,” notes Frances. And that’s not all: Neglecting to wash off your mascara, eyeliner, and other eye makeup can do serious damage to your eyes. Makeup harbours bacteria, which can migrate under your eyelids and lead to styes, inflamed follicles on the lash line, and serious skin infections. Untreated, these infections could eventually lead to blindness.

Discover more night time habits that are ruining your skin.

Laundry is a chore some people try to avoid like the plague – but if you actually do, you’re asking for trouble. And this doesn’t just apply to clothes; bed sheets that haven’t been washed in months (or longer) become a petri dish of bacteria, fungus, dust mites and more – and it’s going to get worse exponentially, as “bacteria multiply rapidly,” says Frances. In the worst-case scenario, unwashed bed sheets – and pyjamas and clothing for that matter – will lead to a staph infection. If a staph infection makes its way into the bloodstream, it can escalate to a more severe condition like sepsis or toxic shock syndrome – which could be fatal.

Check out this A-Z of fabrics and how to wash them.

One of the poorest hygiene habits that ophthalmologist and eye surgeon Alan Mendelsohn, MD, has ever seen is the overwearing of contact lenses that are never cleaned properly – or at all. “Wearing a contact lens for a week or longer duration results in an exponential increase in severe eye infections, including corneal ulcers,” says Dr Mendelsohn, who equates this habit to wearing the same dirty underwear every day.

If the term “corneal ulcer” makes you cringe, it’s for good reason. A corneal ulcer is actually an open sore on the cornea that causes pain, redness, discharge and blurry vision. Most corneal ulcers can be treated with antibacterial, antifungal or antiviral eye drops, but in some cases, a cornea transplant is necessary.

Here are 36 everyday habits that can save your eyesight.

You’re courting yeast infections, thrush and urinary tract infections. Untreated, urinary tract infections can travel to the kidneys and cause sepsis, which can be life-threatening; thrush and yeast infections can cause infertility and internal scarring.

And then there are bras, which most people don’t wash after every wear. Like any unwashed clothes, dirty bras trap oils and bacteria, which will eventually cause acne, rashes and worse.

Here are some handy hints that make doing the laundry less of a hassle.

Sometimes it’s a good thing to be selfish – and personal grooming products are a perfect example of a scenario in which sharing is not necessarily virtuous. For instance, poor oral hygiene habits are bad enough – you certainly don’t need the bacteria from someone else’s mouth infecting yours. And the spread of infections is precisely what can happen if you use someone else’s toothbrush. The consequences of oral infections range from gum disease to potentially fatal conditions like heart disease and diabetes.

And sharing razors isn’t much better, as it can not only spread skin infections like staph, but the practice can transmit viruses like hepatitis and HIV. Sharing hair brushes can put you at risk for lice and skin rashes.

Learn 10 surprising reasons why your hair is so greasy.

It’s common to reuse the same towel after a few showers before tossing it in the laundry. But towels that have been used more than a few times – or have been used once at the gym – should be laundered right away. And they certainly shouldn’t be shared, as they can easily harbor bacteria and bodily secretions.

Sharing sweaty towels is an excellent way to spread dangerous skin conditions and infections, like staph, which can be fatal. Need more reasons not to share towels? How about warts and scabies – or more serious conditions like meningitis, hepatitis and sexually transmitted infections like chlamydia? Chlamydia is a highly curable condition but left untreated it can cause pelvic inflammatory disease and even infertility.

Here are 20 little things everyone forgets to clean – but shouldn’t.

They make flip-flops and water shoes for a reason: When sweat, hair and urine collect on shower floors, they can breed bacteria, fungus and mould. Walking barefoot is a great way to pick up ringworm, athlete’s foot and nail fungus, to name a few notoriously difficult-to-treat conditions.

Ringworm, a fungal infection of the skin, responds well to topical antifungals; however, athlete’s foot can be far more persistent. In the worst-case scenario, athlete’s foot can cause a secondary infection that can lead to fevers and complications of the lymphatic system. Getting a toenail fungus infection means you’ll be losing your nails on a regular basis – and it’s tough to beat: Not even oral antifungals meds can reliably cure the condition, which will eventually cause permanent deformity of nails and nail beds. In extreme cases, nails infected with fungus need to be permanently removed.