When is it time to start flossing with the BURSTkids Flossables?Updated 18 hours agoCaregivers should start flossing a child's teeth once per day as soon as they have two that touch. This is often around the age of 3. Was this article helpful? YesNoWhen is it time to start flossing with the BURSTkids Flossables?Caregivers should start flossing a child's teeth once per day as soon as they have two that touch. This is often around the age of 3.