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 you have a crack in your tooth that has extended into the pulp, the tooth can be treated with a root canal. Some time after the root canal, a crown can be placed to protect the crack from spreading. Until then, you will be given a temporary crown to wear.