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.
6. Tooth infection: Sometimes a bacterial infection of the tooth can cause ear in the pain. A cavity in the tooth, chipped or broken tooth, all of these can cause tooth decay allowing bacteria to infect the pulp. The infection most of the time spreads to the bones supporting the tooth and causing severe pain.