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.
Other potential problems include: Accidental damage to nearby teeth, such as fracture of fillings or teeth. An incomplete extraction, in which a tooth root remains in the jaw â Your dentist usually removes the root to prevent infection, but occasionally it is less risky to leave a small root tip in place.