Start flossing as soon as your child has two teeth that touch — typically between ages 2 and 3. Once teeth are in contact, a toothbrush can no longer reach the spaces between them, and those tight areas become the most common sites for cavities in children. Parents should floss for their child until around age 10–12.
What You'll Learn
When Should Flossing Begin?
Flossing should begin as soon as your child has two teeth that are touching. For most children, this happens somewhere between ages 2 and 3, though it varies. If teeth have gaps between them, flossing is less critical — a toothbrush can still reach those surfaces. But once teeth are in contact, flossing becomes essential.
The spaces between teeth are the most cavity-prone areas in children's mouths. Bacteria and food particles collect there and are completely unreachable by a toothbrush. Flossing once a day — ideally before bed — removes this buildup before it can cause damage.
Best Flossing Tools for Children
Floss picks (flossers)
The easiest option for most children. Small, pre-threaded handles are much easier to maneuver in a small mouth than traditional string floss. Many come in fun colors and characters. This is the best starting point for most families.
Traditional string floss
More effective than floss picks for thorough cleaning, but harder to use in young children. Appropriate once children are older and can assist with the process. Use about 18 inches and wind most of it around your middle fingers, leaving an inch or two to work with.
Floss threaders
Useful for children with braces or dental appliances that make standard flossing difficult.
Water flossers
A helpful supplement, especially for children who resist traditional flossing. Not a complete replacement, but better than no flossing at all.
How to Floss Your Child's Teeth
Have your child tilt their head back or lie down so you have a clear view of all teeth
Gently slide the floss between two teeth using a back-and-forth motion — do not snap it into the gums
Curve the floss into a C-shape around one tooth and slide it up and down along the side of the tooth
Move to the adjacent tooth and repeat the C-shape motion
Use a clean section of floss for each space
Floss all teeth, including the back molars where cavities are most common
If gums bleed, continue flossing — bleeding usually stops within 1–2 weeks of consistent flossing as gum health improves
Frequently Asked Questions
Related Learning Center Articles
When Should My Child Start Brushing?
Start brushing at the first tooth. Here's what to use and how.
How Much Toothpaste Should Children Use?
The right amount depends on your child's age. Here's the guidance.
Your Child's First Dental Visit: What to Expect
Learn what happens, how to prepare, and why early visits matter.
What Is the Correct Way to Floss?
Step-by-step flossing technique for adults and older children.
