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Having your teeth cleaned involves scraping underneath the gumline with a metal tool. This can release pockets of bacteria that were hiding up in there. While a healthy normal person can fight off this bacteria, a person who is getting a blood transfusion is a lot more vulnerable to infection. The potential donor may have seen no trouble after getting the dental work, but if his blood were given to someone already weak and sick it could kill them.

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16y ago

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