excessive heat can cause your hair to be dry, brittle and split ends will occur. when adding heat make sure you do not exceed 450 degrees because once it reaches past that temperature it has the ability to burn and or melt.

Apply a heat protectant to your hair before you do ANY heated styles.

My personal favorite is "Beyond The Zone" heat protectant.

This product can be purchased at any Sally's Beauty Supply store.

In order to keep your hair looking fresh and flawless you must wrap your hair up at night.

Although you have hair extensions you must treat them as if they are your natural hair.

A silk scarf is BEST because it seals moisture and natural oils already contained in your scalp and extensions. cotton scarves would be good for if you were to apply too much product to your hair/extensions. cotton absorbs moisture and also can cause friction. when friction occurs your hair can become dry, brittle and in turn break off.

Wash as needed. When your wash day approaches you want to use a shampoo and conditioner that does not contain any sulfates causing the hair to look dry, brittle and dull.

I recommend Aussie Moist line or Moroccan Argan Oil line (blue packaging)

Any natural oils are great for dry hair and extensions such as: 

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Moroccan Argan Oil

Macadamia Oil Carrot Oil

Olive Oil etc.

they give a great sheen and have amazing aromas.

for bleached hair deep condition with your favorite conditioner when your hair feels dry and/or brittle.

remember, the less heat you apply to your hair the better.

For color treated hair I would also deep condition. However, I would use products catered to color treated hair. The brand I recommend you to use is Tresemme with Argan Oil