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.
Definitely, yes: A bad tooth can cause a lot more than just a toothache, eye pain, headaches, jaw pain, heart pain etc. It's also called a referral pain. See your dentist for evaluation x-rays and treatment. ...