Most babies get their first tooth around 6 months old, and the full set of 20 baby teeth is usually in place by age 3. That means the entire process stretches across roughly two and a half years, with teeth arriving in a fairly predictable sequence from front to back.
The First Teeth to Appear
The lower front teeth (central incisors) are almost always first, typically breaking through between 6 and 10 months. The upper front teeth follow shortly after, arriving between 8 and 12 months. These are the teeth most parents notice first because they’re visible when your baby smiles or cries, and because teething symptoms tend to feel most unfamiliar during this initial round.
Some babies are born with a tooth already visible, while others don’t see anything until closer to their first birthday. Both ends of that spectrum are normal. The age a tooth appears matters far less than the general sequence they follow.
Full Eruption Timeline by Tooth Type
After the front teeth arrive, the remaining 16 teeth come in over the next two years in a predictable pattern. Here’s the typical sequence, based on American Dental Association guidelines:
- Central incisors (front teeth): 6 to 12 months. Lower ones come first, then upper.
- Lateral incisors (next to the front teeth): 9 to 16 months. Upper ones often arrive before the lower pair this time.
- First molars: 13 to 19 months. These are the first back teeth, and they tend to cause more discomfort because of their larger surface area.
- Canines (the pointed teeth between incisors and molars): 16 to 23 months.
- Second molars (the very back teeth): 23 to 33 months. These are the last to arrive and complete the full set.
Lower teeth generally appear slightly earlier than their upper counterparts, with the exception of the lateral incisors. The whole process wraps up when the second molars settle in, giving your child all 20 primary teeth by around age 3.
How Long Each Tooth Takes to Break Through
Once a tooth starts pushing toward the surface, it can take anywhere from a few days to over a week to fully emerge through the gum. You might notice a small white bump or a swollen ridge on the gum before the tooth actually cuts through. Some teeth seem to appear overnight with little fuss, while others, particularly the molars, can cause irritability and drooling for several days before they’re visible.
There’s no set rule for how quickly one tooth follows another. Some children get teeth in pairs (both lower front teeth within days of each other), while others space them out over weeks. Gaps of a month or two between new teeth are completely normal.
When Late Teeth Are a Concern
If your baby hasn’t gotten any teeth by 18 months, it’s worth seeing a pediatric dentist. At that point, a dentist can evaluate whether there’s an underlying reason for the delay, such as a nutritional issue or a less common developmental condition. In most cases, late teethers are simply on the slower end of normal variation, and the teeth show up without any intervention.
Genetics play the biggest role in timing. If you or your partner were late teethers as babies, your child probably will be too. Premature birth can also shift the timeline, since tooth development follows biological age more closely than calendar age.
Why Baby Teeth Matter More Than You’d Think
It’s easy to dismiss baby teeth as temporary, but they serve several functions beyond chewing. Primary teeth hold space in the jaw for the permanent teeth developing underneath. When a baby tooth is lost too early, whether from decay or injury, the surrounding teeth can drift into the gap and block the permanent tooth from coming in straight. This is one of the most common causes of crowding that later requires orthodontic work.
Baby teeth also play a direct role in speech development. Children who lose front teeth early due to decay often struggle with sounds like “th” and “la,” and some develop compensatory speech patterns that require therapy to correct even after the permanent teeth arrive. Taking care of baby teeth from the start, including wiping gums before teeth appear and brushing with a rice-grain-sized amount of fluoride toothpaste once teeth come in, prevents problems that are harder to fix later. The American Academy of Pediatrics recommends scheduling your child’s first dental visit by their first birthday or within six months of their first tooth, whichever comes first.