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According to the American Red Cross, the process of donating blood usually takes about 1 hour and 15 minutes. However, the actual blood drawing is much quicker. Drawing 1 pint of whole blood takes 8-10 minutes. A few factors influence this time, including the person's health and medical history. Donations that require a process called apheresis take longer typically about 1.5-2 hours. Apheresis is a process for filtering out specific components of the blood to donate, such as:
* platelets
* plasma
* red blood cells
* certain leukocytes, such as lymphocytes
The exact time for each of these procedures will vary, but it should not exceed a few hours. In both types of donation, the donor should also factor in time to fill out paperwork and spend some time relaxing after the donation to recover. Regardless of blood product, the average donor can expect to spend just an hour to a few hours from registration to recovery, and they can go on with their day from there.
(Credits: www.medicalnewstoday.com)

Tooth decay, also known as dental caries or cavities, is a disease that causes the breakdown of tooth enamel. Once tooth decay has eroded the enamel, cavities can start to form. According to the American Dental Association (ADA), a tooth consists of three layers: Enamel: Enamel is the hard outer layer that protects the inner layers of a tooth. Tooth enamel contains no living cells and is the hardest structure in the human body. Dentin: Dentin is the second layer of a tooth. When the enamel is damaged, it may expose the dentin. Small tubes within the dentin allow hot and cold food to stimulate the nerves of the tooth. The stimulation of these nerves can cause pain and sensitivity in the tooth. Pulp: The pulp is the center of the tooth. The pulp contains blood vessels, nerves, and connective tissue. Tooth decay can occur in varying degrees of severity. Damage from tooth decay can range from causing wear to the enamel to painful abscesses within the pulp of the tooth. A person who has symptoms of tooth decay should contact their dentist. If left untreated, tooth decay can lead to tooth loss and more serious conditions.
(Credits: www.medicalnewstoday.com)