Hey S., I was curious about when to switch my kids to fluoride toothpaste myself so I looked it up. Here's what the CDC (Center for Disease Control and Prevention) says:
The CDC recommends the following Simple Steps for Kids’ Smiles:
1. Start cleaning teeth early. As soon as the first tooth appears, begin cleaning by wiping with a clean, damp cloth every day. When more teeth come in, switch to a small, soft toothbrush. Begin using fluoride toothpaste when the child is 2 years old. Use toothpaste with fluoride earlier if your child’s doctor or dentist recommends it.
2. Use the right amount of fluoride toothpaste. Fluoride is important in fighting cavities. But if children younger than 6 years swallow too much fluoride, their teeth may develop white spots. To prevent this, use only a small amount of toothpaste (about the size of a small grain of corn). Teach your child to spit out the toothpaste and to rinse well after brushing.
3. Supervise brushing. Brush your child’s teeth twice a day until your child is able to use a toothbrush without help. Then, continue to closely watch brushing to make sure your child is doing a thorough job and using only a small amount of toothpaste.
4. Talk to your child’s doctor or dentist. Check with the doctor or dentist about your child’s specific fluoride needs. After age 2, most children get the necessary amount of fluoride to help prevent cavities if they drink water that contains fluoride and brush their teeth twice a day with a small amount of fluoride toothpaste about the size of a small grain of corn. Parents of children over the age of 6 months should ask about the need for a fluoride supplement if their drinking water does not have enough fluoride. Also, do not let a child younger than 6-years-old use a mouth rinse with fluoride unless the child’s doctor or dentist recommends it.