Gums that bleed when you floss are common, and the usual cause is inflammation from plaque sitting along the gum line. In most cases the bleeding settles once the area is cleaned well every day. This guide explains why gums bleed while flossing, how often you should floss and when to have it checked.
Why do my gums bleed when I floss?
The most common reason is gingivitis, which is early gum inflammation caused by plaque. Inflamed gums are swollen and bleed easily when touched by floss or a toothbrush. Other causes include:
- Starting to floss again after a long break
- Flossing too hard or snapping the floss into the gum
- Hardened plaque (tartar) below the gum line that floss cannot remove
- Hormonal changes, including pregnancy
- Some medicines, such as blood thinners
- Smoking, diabetes and other health conditions that affect the gums
Should I keep flossing if my gums bleed?
Usually yes. Bleeding from gingivitis is a sign the area needs more cleaning, not less. Floss gently once a day and brush twice a day. For many people the bleeding reduces within one to two weeks. If it has not improved after two weeks, book a check-up.
How often should you floss?
Once a day is the usual recommendation. Flossing more than that is rarely needed, and flossing less often lets plaque build up between the teeth, where a toothbrush cannot reach. See our guide on whether to floss before or after brushing.
Benefits of flossing
- Removes plaque and food from between the teeth
- Lowers the risk of decay between teeth
- Helps prevent gingivitis and gum disease
- Helps with bad breath caused by trapped food
How to floss back teeth
Use about 45 cm of floss wound around your middle fingers. Guide it gently between the teeth, curve it into a C shape against one tooth and slide it up and down, then repeat on the neighbouring tooth. For back teeth, floss holders, interdental brushes or a water flosser can make the job easier.
When to see a dentist
- Bleeding that continues after two weeks of daily cleaning
- Gums that are red, swollen, sore or receding
- Bad breath or a bad taste that does not go away
- Loose teeth or changes in your bite
- Bleeding that is heavy or happens without touching the gums
These can be signs of gum disease, which needs professional care. Read about gum disease treatment and our scale and clean appointments, or learn about tartar and dental calculus.
To book a visit at Penrith Dental Care, 42 Castlereagh Street, Penrith, contact our team. This article is general information and does not replace advice from your own dental practitioner.