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.
When that happens, your dentist will fit you with a temporary filling so that your teeth will not shift and your bite will not be affected while you wait for your permanent restoration. When your tooth is being prepped for a dental crown, a temporary filling is placed in the crown opening to keep saliva out.