After removing your makeup, be sure to apply a moisturizer to prevent dryness and protect your skin from environmental stressors.
The nail polish itself does not weaken nails, but the chemicals in some nail polishes and removers can cause damage.
Shampooing your hair every day can strip it of its natural oils, leading to dryness and damage.
Using harsh shampoos can actually make dandruff worse by stripping the scalp of its natural oils.
There are plenty of affordable skincare products that work just as well as their high-end counterparts.