Does a daily aspirin work to prevent heart attacks?

Yes: Studies have show that it helps just as does brushing and flossing teeth every night before bed!

Yes, but at a price: Daily Aspirin clearly reduces the risk of both heart attack and stroke, but also makes you more likely to bleed. If you have coronary disease, you are better taking it. If you are at low risk of heart attack, the benefits may not outweigh the risks. If you don't have known coronary disease but have risk factors, it is a toss-up.