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.
1 Loose tooth and Tooth infection and Dental inflammation (2 causes) 2  Loose tooth and Tooth infection and Dental itch (2 causes) 3  Loose tooth and Tooth infection and Dental lump (2 causes) 4  Loose tooth and Tooth infection and Dental numb (2 causes)  Loose tooth and Tooth infection and Dental pain (2 causes)