Most 15-month-olds have between 4 and 8 teeth, though some may have as many as 12. The range is wide because tooth eruption timelines vary significantly from child to child, and being on the lower or higher end is rarely a cause for concern.
What Teeth Typically Appear by 15 Months
The first teeth to break through are usually the two lower central incisors (the bottom front teeth), which appear between 6 and 10 months. The two upper central incisors follow at 8 to 12 months, and the upper lateral incisors (the teeth flanking the front two) come in between 9 and 13 months. By 15 months, most children have at least these front teeth in place.
At this age, your child may also be cutting their first molars. The upper first molars typically erupt between 13 and 19 months, and the lower first molars between 14 and 18 months. The lower lateral incisors can appear anywhere from 10 to 16 months. So a 15-month-old right in the middle of the curve might have 6 to 8 visible teeth, with molars just starting to push through. A child who started teething early could have 10 or more, while a late teether might still be working on their fourth or fifth.
The canines (the pointy teeth between the incisors and molars) don’t usually show up until 16 to 23 months, so it’s normal for your child to have a gap in that spot for now.
The Order Matters More Than the Number
Pediatric dentists pay more attention to the sequence of eruption than to how many teeth appear by a specific birthday. The typical pattern starts with the lower front teeth, moves to the upper front teeth, then spreads outward to the lateral incisors and first molars. Teeth generally fall out years later in the same order they came in.
If your child’s teeth are arriving in roughly that sequence but on a slower timeline, that’s almost always fine. Some children don’t get their first tooth until after their first birthday and then catch up quickly. The full set of 20 primary teeth usually fills in by age 3, regardless of when the first one appeared.
When Late Teeth Are Worth Checking
If your child had no teeth at all by 9 months, that’s the threshold where most providers recommend looking into it. By 15 months, nearly all children have at least a couple of teeth. A complete absence of teeth at this age could point to nutritional factors, genetics, or less commonly, an underlying condition affecting tooth development. Your pediatrician or a pediatric dentist can evaluate whether imaging is needed to confirm that teeth are present beneath the gums and simply running late.
Having fewer teeth than average, though, is different from having none. A 15-month-old with 3 or 4 teeth is still well within normal limits.
Teething Symptoms at This Stage
At 15 months, your child is likely dealing with molar eruption, which tends to be more uncomfortable than the front teeth because molars are larger and have a broader surface pushing through the gum. The most common symptoms associated with teething are low-grade fever, excessive drooling, and loose stools. In one study of children under 36 months, fever was the most prevalent symptom, appearing in about 16% of teething episodes, while drooling occurred in about 12%.
A truly high fever (above 101°F or 38.3°C) is not a normal teething symptom. If your child has a significant fever alongside teething, it’s worth investigating other causes like an ear infection or virus rather than assuming the teeth are responsible.
Caring for New Teeth
Once teeth are present, decay can start. The American Dental Association recommends keeping bottles filled with only formula, breast milk, or milk, and having your child finish bottles before naps and bedtime rather than falling asleep with one. Pooling milk or juice against the teeth during sleep is a major driver of early childhood cavities, sometimes called baby bottle tooth decay. By 15 months, transitioning to a cup is a good goal if you haven’t already.
For brushing, use a tiny smear of fluoride toothpaste, roughly the size of a grain of rice, on a soft-bristled brush twice a day. That small amount provides cavity protection while minimizing the fluoride your child swallows. A pea-sized amount comes later, around age 3.
Both the American Academy of Pediatric Dentistry and the American Dental Association recommend a first dental visit within 6 months of the first tooth erupting, and no later than 12 months of age. If your 15-month-old hasn’t been to a dentist yet, scheduling that first visit now is a good idea. Early visits are brief and focused on checking that development looks normal and establishing a baseline for future care.