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.
Gum Grafting / Recession. Aggressive tooth brushing, periodontal disease, and genetically thin tissue can lead to gum recession, which ultimately results in exposed tooth roots. When tooth roots are exposed, teeth appear too long and can become sensitive to hot and cold liquids and foods. Also, the exposed roots are in danger of decay.