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.
How to Home Treat a Toothache or Any Minor Mouth Infection. A toothache is usually the result of poor dental hygiene, tooth cavities or decay, and injuries to the jaw or mouth. Sometimes, pain that's felt in the tooth is actually due to pain in other parts of the body, also known as referred pain. For example, an earache or nasal infection can sometimes cause tooth pain.