There are some skin care and beauty myths that won’t disappear and it’s time to put them to rest for good. Last month, we shared five common beauty myths you can stop believing. In honor of another Friday the 13th, Dr. Joel Schlessinger, board-certified dermatologist and founder of LovelySkin.com, is helping us bust five more superstitions that are messing with your beauty routine.

Myth: Drinking water hydrates your skin.

Sipping on water throughout the day is great for your body but this hydration doesn’t actually reach your skin unless you’re extremely dehydrated. 

"I always tell this to my patients and it seems that it still pops up on every magazine article out there!" says Dr. Schlessinger.

Instead, skin is hydrated through one of two different ways: natural oil production or topically applied creams, lotions and serums. Drinking plenty of water is still essential to your overall health but it isn’t a good substitute for your daily moisturizer.

Myth: Trimming your hair will make it grow faster.

Trimming the ends of your hair won’t do anything to the root, where the hair actually grows.

"The hair itself that we see is actually just an inert, non-living part of us, so anything you do to it won't affect it," Dr. Schlessinger says.

Regular trims only create the illusion that hair is growing faster because you stop seeing split ends. Breakage starts at the bottom of strands and makes its way up the hair follicle. This damage makes any added length appear less noticeable over time.

Myth: Staying in the shade protects you from UV damage.

Lounging in the shade doesn’t mean you can skip applying sunscreen. UV radiation still bounces off sand, water, snow and pavement, causing skin damage even when you’re not in direct sunlight.

"While I like the thought that my patients will stay in the shade, I definitely encourage sunscreen usage at the same time," Dr. Schlessinger says.

The same also goes for cloudy days. According to the Skin Cancer Foundation, up to 80 percent of the sun’s UV rays can pass through clouds. This is why it’s very important to apply a broad spectrum sunscreen like EltaMD UV Clear SPF 46 every single day.

Myth: You know your skin is clean when it squeaks.

If your face feels tight and dry after washing, you’re either using the wrong cleanser or cleansing too much. This squeaky clean feeling means you’re stripping your skin of natural oils and disrupting the natural moisture balance. A good cleanse should leave your complexion feeling calm, clean and comfortable. Make sure the cleanser you’re using is designed for your skin type and only wash your face twice a day.

"We are going to see much less 'squeaky clean' skin with the changes in ingredients for cleansers recently," Dr. Schlessinger adds. "Your skin will still be clean, though!"

Myth: You can eliminate cellulite for good.

There are many products that promise to banish cellulite for good, but the truth is there’s no way to permanently eliminate dimpled skin.

"While we have good treatments for cellulite, we still don't have a cure," says Dr. Schlessinger. "And I don't really think that much of the lasers, such as Cellulaze, that have been introduced."

Cellulite is characterized by fat deposits that give the skin a lumpy appearance. When the connective fibers underneath the skin become weak or lose elasticity, these fat deposits become more visible. There are treatments available that can help diminish the appearance of cellulite but you’ll have to continue using these products to maintain best results.

Is there a common beauty myth you’d like us to debunk? Share with us in the comments.