Most 18-month-olds have around 12 teeth, though anywhere from 10 to 16 is within the normal range. Children’s teeth come in on their own schedule, so some toddlers will be ahead and others behind those numbers without any cause for concern.
What 12 Teeth Looks Like
By 18 months, a typical toddler has all four upper and lower front teeth (the central and lateral incisors), plus the first set of molars starting to push through. That adds up to roughly 12 teeth. Between 16 and 23 months, the count usually jumps to about 16 as the canines (the pointed teeth between the front teeth and molars) fill in.
The full set of 20 baby teeth generally arrives by age 3. So at 18 months, your child is a little past the halfway mark. The teeth that tend to come in next are the upper and lower canines, followed eventually by the second molars further back.
The Order Teeth Typically Appear
Baby teeth follow a loose pattern, though the exact timing varies from child to child. Here’s the general sequence most toddlers follow:
- 6 to 10 months: Lower central incisors (the two bottom front teeth)
- 8 to 12 months: Upper central incisors (the two top front teeth)
- 9 to 13 months: Upper lateral incisors (flanking the top front teeth)
- 10 to 16 months: Lower lateral incisors
- 13 to 19 months: First molars (upper and lower)
- 16 to 23 months: Canines
- 23 to 33 months: Second molars
At 18 months, you’re right in the window where first molars are actively erupting. These are the broad, flat teeth toward the back of the mouth. Because they’re bigger than the front teeth, they can cause more discomfort as they break through the gums.
Why Molars Are Tougher Than Front Teeth
If your 18-month-old seems crankier than they were during earlier teething, the first molars are a likely reason. Their larger surface area means more gum tissue has to stretch and break, which can make this round of teething noticeably more uncomfortable than the front teeth were.
Common signs that molars are coming in include extra drooling, red or swollen gums near the back of the mouth, fussiness, trouble sleeping, decreased appetite, and a strong urge to chew or bite on things. A slight rise in temperature can happen, but a true fever above 100.4°F (38°C) is not caused by teething. If your toddler has a higher fever, something else is going on.
When Fewer Teeth Could Signal a Delay
Some babies are simply late bloomers. A toddler with 8 or 9 teeth at 18 months isn’t automatically behind in any meaningful way. The wide age ranges for each tooth reflect just how much normal variation exists.
That said, if your child has no teeth at all by 18 months, pediatric dentists consider that a potential delayed eruption. At that point, a dental visit can help rule out uncommon causes like nutritional deficiencies, genetic conditions, or issues with the jaw. For most late teethers, the teeth are simply taking their time and will show up on their own. But zero teeth by 18 months is the threshold where it’s worth getting checked.
Caring for New Teeth at This Age
Even though baby teeth are temporary, they’re vulnerable to decay from the moment they appear. At 18 months, you should be brushing your toddler’s teeth twice a day with a soft-bristled brush. Use fluoride toothpaste, but only a smear the size of a grain of rice. The AAP, ADA, and American Academy of Pediatric Dentistry all recommend fluoride toothpaste starting with the very first tooth, just in that tiny amount for children under 3.
If your toddler hasn’t had a dental visit yet, now is a good time. The current recommendation is to see a dentist by a child’s first birthday or within six months of their first tooth erupting, whichever comes first.
Preventing Early Cavities
The biggest risk to toddler teeth at this age is prolonged contact with sugary liquids. Milk, formula, and fruit juice all contain sugars that feed the bacteria responsible for decay. Putting a toddler to bed with a bottle is one of the most common causes of early childhood cavities, sometimes called baby bottle tooth decay. The liquid pools around the teeth overnight when saliva production is low, giving bacteria hours of fuel.
A few habits make a real difference. Finish bottles before naptime or bedtime rather than letting your child fall asleep with one. If you’re transitioning to a sippy cup, use it for water between meals and save milk for mealtimes. Offer sugary snacks and drinks only with meals, when saliva flow is higher and naturally helps rinse away acids. Between meals, stick to water and nutritious snacks rather than juice or sticky foods. These small changes protect both the teeth your toddler has now and the ones still working their way in.