1 Plasma donors may donate as often as every 28 days. 2  Platelets donors may donate as frequently as every eight days, and up to 24 times in a 12-month period. 3  Double Red Cell donors maybe donate as often as every 168 days.
In some cases, perfectly straight teeth can become crooked with age, as the structure of your mouth changes, or due to tooth loss and movement of the remaining teeth. Teeth straightening can be achieved by a variety of different cosmetic dental techniques.
Falling, receiving a blow to the face, or biting down on something hard -- particularly if a tooth already has some decay -- can cause a tooth to chip or break. If you discover you have broken or chipped a tooth, don't panic. There are many things your dentist can do to fix it. How to Care for a Chipped or Broken Tooth