When Can Babies Start Using Toothpaste? | First Tooth Rule

Babies can start using fluoride toothpaste as soon as their first tooth erupts, typically around 6 months of age.

Many parents are surprised to learn that the waiting game they expected isn’t necessary. The American Academy of Pediatrics now recommends fluoride toothpaste from the very first tooth, replacing older advice that told parents to wait until age two. The key isn’t delay — it’s portion control. A rice-grain-sized smear is all a baby under three needs, and supervision matters more than most people realize.

Why The Old Advice Changed

The older guidance to wait until 24 months was scrapped because tooth decay was showing up earlier than expected, and fluoride proved too effective at prevention to hold back.

These size limits exist for one main reason: reducing fluorosis risk from swallowed fluoride.

How To Brush A Baby’s Teeth: Step By Step

Start the routine the moment that first tooth breaks through. Here’s the order that works, per current official guidance:

• Choose a soft, age-appropriate child toothbrush with a small head.
• Apply a rice-grain-sized smear of fluoride toothpaste — not a full dab.
• Brush twice daily, gently covering all tooth surfaces.
• For children under three, the tiny amount means foam is minimal; that’s expected.

From ages three to six, increase to a pea-sized amount. At this stage, begin teaching your child to spit rather than swallow. Supervision is critical until you’re confident they reliably spit — most kids aren’t there until age six or later.

The most common mistake parents make is using a full adult-size strip. It looks harmless, but it multiplies fluoride ingestion for a small child. The rice-grain measure exists specifically to prevent fluorosis while still protecting teeth.

Safety Concerns And What To Watch For

Common mistakes parents make include:

• Waiting until the toddler years instead of starting at the first tooth
• Using a full adult-size dab instead of a smear or rice-grain amount
• Letting children brush unsupervised before they can reliably spit
• Using too much toothpaste too early, increasing fluorosis risk

If your child swallows a tiny smear now and then, there’s no reason to panic — the amounts are small by design. The concern only compounds when oversized portions become routine.

Picking The Right Toothpaste

Look for a children’s toothpaste that contains fluoride — that’s the active ingredient doing the decay prevention. Many “training” toothpastes skip fluoride entirely, which defeats the purpose of starting early. Flavor matters for compliance; mild fruit flavors tend to win over mint with toddlers.

When you’re ready to choose, our tested roundup of the best baby toothpaste options breaks down which formulas work and which are just marketing.