Is it bad to blow dry my hair?

Leaving moisture in the hair for too long can cause the hair to breakdown the matrix that holds the bundles together. Blow drying your hair to at least 75% dry, especially if you wash at night or have thick or dense hair can actually make your hair/scalp healthier. Blow drying helps the hair cuticle to lay smoother and reseal itself. Blow drying will also help with scalp health. Leaving the scalp wet for long periods of time will cause dry scalp and in more severe cases fungal or bacterial infections on the scalp. It is important to be mindful of the blow dryers heat settings if you have fine hair you should never use your dryer above the medium heat setting otherwise you can cause heat damage.