Nobody likes it when their gums bleed. Besides being a little alarming, it can be painful too. But it’s important to understand why your gums are bleeding so that you can fix the problem and improve your dental health.

Here are six reasons why your gums could be bleeding.

1. Flossing

If it’s been awhile since you’ve flossed, doing so might make your gums bleed. While it might seem counterintuitive, this bleeding will actually go away with repeated flossing, so keep it up! If you use the bleeding as an excuse to stop flossing, your gums will be worse off and the cycle will just continue.

2. Medications

Some medications, like blood thinners, make you more prone to bleeding. Make sure your dentist knows which meds you’re taking so they can take that into consideration when they see you. Treat your dentist like your doctor—the more they know about your health, the better they’ll be able to take care of you.

3. Hard Toothbrush

Hard or stiff toothbrushes can be too tough on your teeth and gums, and they can cause swelling and bleeding. Always use a soft-bristled toothbrush unless instructed otherwise by your dentist. Don’t forget to replace your toothbrush every three to four months, too.

4. Pregnancy

Some women experience swollen and bleeding gums while pregnant. While unpleasant, this is natural and should not cause alarm. Make sure your dentist is aware of your condition.

5. Bad Diet

Bleeding gums can be a symptom of an unhealthy diet. Make sure you’re eating fruits and vegetables to give you important minerals like calcium, vitamin D, vitamin C, and magnesium.

6. Poor Dental Hygiene

Bleeding gums might just mean you’re not taking care of your teeth well enough. Make sure you’re brushing twice a day and flossing every day. Perhaps consider an electric toothbrush or a water flosser to make cleaning your teeth more exciting.