1. Nails need to 'breathe' in order to grow "Nail polish can actually help protect the nail from everyday damaging elements, such as drying soaps and general breakage. Ensuring you are hydrated from the inside, by drinking lots of water and using a quality cuticle oil, will help nourish nails and encourage healthy growth," says Charlotte Knight, creative director and founder, Ciate London.

2. A tan is healthy "A tan is a visible indication of sun damage, therefore there is NO such thing as a healthy tan. Healthy sun exposure should be limited to less than the time it takes to tan or burn. Burning even just once accelerates the risk of developing skin cancers, and can also accelerate the ageing process," says Nature's Best nutritionist Keri Filtness.

3. Oils are not suitable for oily skin "Oils actually work in harmony with your skin, as they mimic the skin's natural process of oil production and help to balance the skin. If the skin feels greasy after using an oil, it's usually that too much has been applied. One drop of oil goes a long way," says Kirsty Mawhinney, skincare expert at Bio-Oil.

4. Post-facial breakouts are just toxins coming out of pores "There's no scientific reasoning to support this. If you suffer from breakouts post-facial, it is more likely to be an inflammation as a result of extractions, or due to pores getting clogged from products that are too thick for your skin type," says Liz Warom, founder, Temple Spa.

5. Juices are great for your skin "Some juices - with lots of sweet fruits or those with added sugar - are actually bad for your skin. Try swapping sugary fruits in your smoothie for vegetables, such as cucumber, carrots or spinach, and favour fruit such as bananas, grapes and pears. These are high in fibre, antioxidants and vitamin C," says Liz Warom, founder, Temple Spa.