Most 18-month-olds have around 12 teeth, though anywhere from 10 to 16 is within the normal range. Baby teeth don’t follow a strict calendar, so some toddlers hit this number a few months early while others lag behind without any cause for concern.
Which Teeth Are Usually In by 18 Months
The four front teeth, two upper and two lower central incisors, are typically the first to arrive, often breaking through between 6 and 12 months. The lateral incisors (the teeth on either side of the front four) usually follow, and by roughly 13 to 19 months most children have all eight incisors plus their first four molars, totaling about 12 teeth.
The canines, the pointed teeth between the incisors and molars, tend to emerge next. Some 18-month-olds already have one or two canines poking through, while others won’t see them for a few more months. Between 16 and 23 months the tooth count often jumps to around 16 as these canines fill in. The second set of molars, the last to arrive, typically comes in closer to age 2 or beyond. Most children have their full set of 20 primary teeth by age 3.
What Counts as Delayed
There’s a wide window for normal tooth eruption, and having fewer teeth than the average at 18 months is rarely a sign of a problem. Some babies don’t get their first tooth until 12 or even 14 months and still end up with a perfectly healthy set. The general guideline from medical providers is to seek evaluation if your child hasn’t developed any teeth by 9 months. Beyond that threshold, a slower pace is usually just your child’s individual timeline.
Factors like genetics, premature birth, and low birth weight can all shift the eruption schedule. If both parents were late teethers, their child is more likely to be one too. As long as teeth are appearing gradually, even if the order is a little different from the textbook sequence, there’s typically nothing to worry about.
Caring for New Teeth at This Age
Once teeth start appearing, they’re vulnerable to decay. Brushing should begin with the very first tooth. For children under 3, the American Dental Association recommends using fluoride toothpaste in an amount no larger than a grain of rice. That tiny smear, roughly 0.1 milligram of fluoride, is enough to protect enamel without posing any risk if swallowed. You can move up to a pea-sized amount once your child turns 3.
At 18 months, your toddler can’t brush effectively on their own. Plan on doing the brushing yourself, ideally twice a day, with a soft-bristled toothbrush designed for toddlers. Getting into a consistent routine now makes it easier as more teeth come in and your child starts to resist (which they will).
Foods That Protect or Damage New Teeth
The foods and drinks your toddler consumes have a direct effect on those freshly erupted teeth. Sugary snacks, juice, soda, and sticky or chewy foods like dried fruit and caramel are the biggest offenders. They lower the pH in your child’s mouth, creating an acidic environment where bacteria thrive and attack enamel. Even starchy foods like crackers, white bread, and chips break down into sugars that feed the same process.
Limiting juice is one of the simplest things you can do. Water and milk are far better choices between meals. When your toddler does eat something sweet or starchy, offering water afterward helps rinse sugars off the teeth before bacteria can get to work.
The First Dental Visit
The American Academy of Pediatric Dentistry, the ADA, and the American Academy of Pediatrics all recommend that children have their first dental visit during their first year of life. If your 18-month-old hasn’t been to a dentist yet, it’s a good time to schedule that appointment. Early visits are brief and low-key. The dentist checks for signs of decay, looks at how teeth are coming in, and gives you guidance on brushing and diet tailored to your child’s mouth.
Pacifiers and Tooth Alignment
If your toddler still uses a pacifier, 18 months is the age when dental organizations recommend starting to phase it out. Pacifier use beyond 18 months can begin to influence how the jaw and teeth develop, increasing the risk of bite problems like a posterior crossbite (where the upper and lower back teeth don’t line up properly) or an anterior open bite (where the front teeth don’t meet when the mouth is closed). Children who continue using a pacifier past 36 months have a significantly higher incidence of these issues.
The good news is that bite changes caused by pacifier use before age 3 tend to correct themselves once the habit stops. So weaning now, while your child’s canines are just starting to emerge, is well-timed to avoid lasting effects.