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.
Called delayed eruption, the slow appearance of the permanent tooth often happens when a baby tooth is knocked out or is damaged after a fall, turns dark, and then comes out a bit early. Sometimes the new tooth doesn't show up for well over a year, McTigue says. If your child is seeing a dentist every six months as recommended, just ask about it the next time you're in. X-rays are seldom needed to see what's going on.