- how can you protect your ends while in twists?
First and foremost, wear a satin bonnet or scarf to bed. Cotton pillowcases can make the ends of your twists dry and brittle. Next, make sure your ends are sufficiently moisturized. Lastly, if your twists brush your shoulders (or beyond), pin it up during the day. This
minimizes snagging and drying of the ends from contact with your clothes. - ... What products should you use?
Use products that leave your twists sufficiently moisturized. This includes
a good deep conditioner and moisturizer on the day you twist. Also use products that
do not contain humectants (e.g., glycerin, propylene glycol)
if you want to keep shrinkage at bay for as long as possible. Other than these two conditions, use what works for you and what you like. (I use LeKair Cholesterol for deep conditioning and a shea butter mix to seal after rinsing.)
- ... and should end papers be used to protect ends?
No, end papers are not necessary.
- ... Also how long should you keep twists in for optimal growth? Should you keep a style in one, two or three weeks
For optimal growth, twists should be worn for as long as your hair can handle. The less you manipulate your hair via styling, the less breakage, and the more length retention.
Ideally, twists should be worn for 2-5 weeks at a time with minimal washing (to prevent locking and meshing). Find a duration that works best for your hair. (I wear mine for 3-4 weeks at a time.)