Most medications do not prevent you from donating blood. Common medications such as those used to control blood pressure, birth control pills and over-the-counter medications do not affect your eligibility. If you have recently taken antibiotics, you must have completed the course prior to donating.
Yes, a tooth infection can cause a headache. Also, be aware that certain sinus conditions can mask as tooth problems.
A toothache is a pain in or around a tooth that may be caused by: Tooth decay; Abscessed tooth; Tooth fracture; A damaged filling; Repetitive motions, such as chewing gum or grinding teeth; Infected gums; Symptoms of a toothache may include: Tooth pain that may be sharp, throbbing, or constant. In some people, pain results only when pressure is applied to the tooth. Swelling around the tooth; Fever or headache; Foul-tasting drainage from the infected tooth; When Should I See a Dentist About a Toothache? See your dentist as soon as possible about your toothache if: You have a toothache that lasts longer than 1 or 2 days; Your toothache is severe