Most 15-month-olds have between four and eight teeth, though some may have more or fewer. By this age, the lower and upper central incisors (the four front teeth) have typically come in, and the lateral incisors on either side may be fully through or still working their way out. First molars are also just starting to appear around this time.
Which Teeth Come In First
Baby teeth follow a fairly predictable sequence, starting with the bottom front teeth. The lower central incisors usually appear between 5 and 8 months, followed by the upper central incisors between 6 and 10 months. Next come the lateral incisors, the teeth flanking the front two. Upper laterals tend to arrive between 8 and 12 months, while lower laterals come in between 7 and 10 months. That gives most babies their first four to eight teeth by the time they reach 15 months.
After the incisors, the first molars begin breaking through. These are the broader, flat teeth further back in the mouth, and they typically emerge between 11 and 18 months for both the upper and lower jaw. So at 15 months, your child may already have a molar or two starting to push through, or that process may still be a few weeks away. The canines (the pointed teeth between the incisors and molars) come later, generally between 16 and 20 months, so they’re not expected yet.
A Wide Range of Normal
Tooth eruption timelines vary significantly from child to child. Some babies cut their first tooth at four months, while others don’t get one until 15 months. The American Academy of Pediatric Dentistry notes that many otherwise normal infants do not follow the standard eruption schedule. Genetics, nutrition, and prematurity can all influence timing. A 15-month-old with only two teeth and a 15-month-old with ten teeth can both be developing normally.
If your child hasn’t had any teeth appear by nine months, it’s worth seeing a pediatric dentist to rule out any underlying issues. But even that benchmark comes with context: the normal range for a first tooth spans from four to 15 months, so a slightly late start is rarely a sign of a problem.
What Molar Teething Feels Like for Your Toddler
If your 15-month-old is fussier than usual, first molars could be the reason. These teeth are larger than incisors and have a broader surface pushing through the gums, which can cause more discomfort. Common signs include increased drooling, chewing on objects, sore or tender gums, irritability, and occasionally a mild rise in temperature (though not a true fever).
To help with the discomfort, you can rub your child’s gums with a clean finger or a piece of wet gauze for about two minutes. The pressure helps ease the pain, and you can do it as often as needed throughout the day. Chilled (not frozen) teething rings or a cold washcloth to chew on also provide relief.
Caring for New Teeth
Even if your toddler only has a few teeth, brushing matters right away. The American Academy of Pediatric Dentistry recommends brushing twice daily with a soft, age-appropriate toothbrush and a tiny smear of fluoride toothpaste, about the size of a grain of rice. This small amount is safe to swallow and helps strengthen enamel as teeth come in.
Nutrition plays a direct role in how well those teeth develop. Children ages one to three need about 700 milligrams of calcium per day. Milk, yogurt, and cheese are the easiest sources, but broccoli and tofu also contribute. Phosphorus and vitamin D work alongside calcium to build strong enamel, so a varied diet with dairy, vegetables, and protein supports both the teeth that are already in and the ones still forming beneath the gums.
The First Dental Visit
The American Academy of Pediatrics recommends that children see a dentist by their first birthday or within six months of their first tooth, whichever comes first. If your 15-month-old hasn’t been to the dentist yet, now is a good time to schedule that first visit. Early appointments are typically short and focused on checking that teeth and gums look healthy, and they give you a chance to ask about brushing technique, fluoride, and what to expect as more teeth arrive over the next year or two.