Only shampoo at the roots because shampoo strips the hair and scalp of the natural oils. These oils rarely reach the ends and because of this leaving them to be drier. Shampooing all the way to your ends can strip any remaining moisture your ends may retain. When you rinse the shampoo out of your hair, it runs down the rest of your hair to your ends, and that is enough to keep it clean. On the other end, conditioner is much heavier and deposits these oils/moisture. If you apply on the roots it will leave your freshly cleaned hair looking greasy. Pull your hair back like you'd be putting your hair into a ponytail at the nape of your neck. Everything from that fist down is where you would apply the conditioner.
Washing your hair everyday
If you wash your hair everyday, it's probably because you claim it is too greasy by day 2 to wear. Because you are washing it everyday is precisely the reason why your hair is so greasy looking. By shampooing your hair everyday, you are stripping the scalp of its natural oils. You scalp does require some oil to protect itself. By stripping the oils everyday, you are causing your scalp to over produce oil. Here is a in depth article I wrote on how to fix this cycle. How To: Train Your Hair To Go Longer Between Washes and Why I Don't Wash My Hair Everyday - And Why You Shouldn't Either.
Brushing wet hair
Your hair can stretch up to 50% it's original length when wet because of its elasticity. This does not mean your hair is longer when wet. It is in a much more fragile state and by ripping a brush through it, you can and will pull it to its limit and snap it. None of us want breakage. What should you do? Use a comb and start in small sections from the bottom up, or use a brush specifically made for wet hair such as the wet brush or a tangle teaser. They have more flexible bristles and much shorter bristles that bend/glide over before they'll pull on the hair. Always start brushing/combing the hair from the bottom up. Do not be rough ripping a brush through it.
Applying dry shampoo the morning of
Most skeptics and haters of dry shampoo, are because they don't use the product correctly. Common complaints are leaving a gray hue at the roots on dark hair or not absorbing all the way. Here is my tip for everyone- spray the dry shampoo 8"-12" away from your roots at night. Do not rub it in. Go to bed. The tossing and turning at night and hours of sleep allow you to wake up with fresh and clean looking hair. If you do have to use dry shampoo the morning of, spray it as soon as you know you'll need it. The extra time will help. Scrub the dry shampoo into your roots as if you were lathering real shampoo. This will really help work it in. After you do this, comb all the way through your hair starting at the roots. This final step helps it blend in best. There are also colored dry shampoos available for purchase.
Not using thermal protection
Protect your dang hair from the heat you apply to it. This isn't just for flat irons, wands, and curling irons; this is also for blow drying and hot rollers. Most people may use a heat protection spray before straightening their hair but not before blow drying. Look for a lightweight styling lotion that offers heat protection. Make sure to use enough thermal protection product too. Think about it- you are literally squeezing your hair between 2 hot plates reaching temperatures up to 450 degrees Fahrenheit. It is said the average blow dryer varies between 100 degrees Fahrenheit up to 200 degrees Fahrenheit. Would you want to touch something that hot without protection on your hands? No? So don't do that to your hair.
Not giving your hair a day off
Your hair needs a break from heat styling. So now that you are not washing your hair everyday, your hair will be able to maintain certain styles a few days. You can also use styles that require no heat. This can be your natural texture, or making waves with braids, top knots, half up half down styles, and braid styles as well.
Dying your hair with box color
Box color is literally the worst. THE WORST! It not only contains metallic salts (which are awful for your hair btw,) but the high level of developer is extremely damaging to the hair. Typical professional color uses developer in 10 Volume, 20 Volume, 30 Volume, and not that common to do 40 Volume. It is formulated based off your current hair, and the color you want to achieve. Box color not only doesn't tell you what volume developer is used (very high) but it's really formulated as a one size fits all.
This means it's not addressing your current hair level or what undertones it needs to combat to achieve that color. That is why you see orange and yellow awful colors so often. It isn't toning that warmth out. The metallic salts are so so so bad for your hair. I have seen clients come into the salon and lie about not having box color on their hair, and then see their hair melt off and smoke. MELT AND SMOKE PEOPLE! I have seen it first hand. Also it does not mean you don't have any color on your hair because its been 6 months since you last put box dye on it. That just means your midshaft to ends are still very much colored and need a different formula to accommodate that. Also, please never lie to your hairdresser about your hair history. We are asking because we have advanced education on the results of these chemicals mixing.