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.
What Causes Teeth to be Infected? An infection of the pulp within your tooth can only happen when foreign substances find their way into the tooth. When you eat food, and your enamel is weak or breached due to dental decay, then the food can penetrate deeply into the inner layers of the tooth.