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.
Oh no, my childâs front tooth is turning dark! What is going on? A child may have a primary baby tooth turn dark if he or she bumps and injures it. Usually this happens a few weeks after an accident. It will usually turn a gray or purple hue. In general, if the tooth is displaced or knocked very loose at the time of the injury, there seems to be a greater chance of it turning dark. If it doesnât turn dark after a month, it likely will be on a road to healing.