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.
If your crown cracks, breaks or comes loose, you can take steps to mitigate the problem until you see your dentist: 1  Examine the area. Look at the broken crown and see if pieces appear to be missing or dislodged. 2  Once the crown is out look at the remaining tooth.