What Does the Start of Teething Look Like?

The earliest visible sign of teething is a change in your baby’s gums: the tissue over an incoming tooth becomes swollen, red, and sometimes develops a faint bluish or purple hue where the tooth is pushing through. These local gum changes are the most reliable physical marker, identified by dentists in about 70% of babies with an actively erupting tooth. But teething usually announces itself through behavior before you can see anything at all, with increased drooling, chewing on hands or objects, and fussiness that can start days or even weeks before a tooth breaks the surface.

What the Gums Actually Look Like

If you gently pull your baby’s lip down and look at the gum ridge, teething gums have a distinct appearance compared to healthy, smooth pink tissue. The area directly above the emerging tooth becomes raised and puffy. In a study that compared what mothers noticed with what dental professionals documented, swelling was consistently identified about half the time by both groups, reddening was recognized in roughly 62% of cases, and a bluish-purple discoloration called livedo was the most consistently agreed-upon sign, identified in over 96% of actively erupting teeth.¹ That purple tinge is simply blood pooling under the thin gum tissue as the tooth presses upward. It looks alarming but is harmless.

The lower front teeth almost always arrive first. So when you are checking for teething signs, focus on the center of the bottom gum. You may feel a hard little ridge under the surface before anything becomes visible. Some parents describe it as a tiny grain of rice just beneath the skin. Once the tip of the tooth breaks through, you will see a small white point, sometimes barely wider than a pinhead, poking above the gum line.

When the First Tooth Typically Appears

Most babies cut their first tooth around six months of age, but the normal window is wide. A prospective study of healthy infants found that the timing of first tooth eruption ranged from 4 to 13 months. By the sixth month, only about a quarter of infants had at least one tooth, while by nine months that figure jumped to roughly 85%.² So a baby who has no teeth at seven or eight months is still well within the normal range.

Several factors can shift that timeline. Babies who were smaller at birth or whose growth has lagged in the first months tend to get teeth a bit later. Children shorter than 49 cm at birth had fewer emerged teeth by six months compared to larger newborns, and growth deficits at six months continued to predict delayed eruption.³ Nutrition plays a role too: babies fed cow’s milk or formula in the first year showed slightly slower eruption compared to breastfed infants in at least one cohort.² Premature birth may also delay teething, though the evidence on that is mixed.⁴

Drooling and the Urge to Chew

Drooling is one of the earliest and most common behavioral signs, reported in over half of teething babies in a large pooled analysis.⁵ Your baby’s shirts may suddenly be soaked through, and you will find yourself going through bibs faster than you thought possible. The drooling happens partly because the movement of a tooth under the gum irritates the surrounding tissue, and partly because babies at this age are ramping up saliva production as a normal developmental milestone. Sorting out which cause is the main one can be tricky, especially around four to five months when salivary glands are maturing regardless of whether a tooth is on its way.⁶

Alongside the drooling comes a fierce desire to chew. Babies will gnaw on their own fists, your fingers, the corner of a blanket, or anything within reach. Increased biting and gum-rubbing were both statistically linked to active tooth eruption in a prospective study that tracked individual tooth emergence.⁷ This chewing is not random; applying pressure to the swollen gum ridge helps relieve some of the discomfort. Chilled teething rings work on the same principle, with the cold narrowing blood vessels in the tissue to reduce swelling while the firm surface provides counter-pressure.⁸

Irritability and Fussiness

If your baby is suddenly crankier than usual for no obvious reason, teething is a reasonable suspect. Irritability is the second most commonly reported symptom, showing up in about 68% of teething episodes across thousands of children studied.⁵ Babies may be clingy, whiny, or just generally unsettled in the days around eruption. Some refuse solid foods while still accepting the breast or bottle, likely because the spoon puts pressure on sore gums.

The fussiness tends to peak in the day or two right before the tooth breaks through and settle fairly quickly after the white tip appears. This is not a months-long process per tooth. Most of the discomfort is concentrated in a brief window. If your baby has been inconsolable for more than a few days without any visible gum changes, something else may be going on.

Does Teething Actually Disrupt Sleep?

This is one of the most asked questions among parents, and the answer is more complicated than expected. Many parents report that their baby sleeps terribly during teething. In one study, over half of parents said sleep was disrupted during teething episodes. But when researchers actually recorded babies sleeping on video, comparing nights when teeth were actively erupting to nights when they were not, they found no measurable differences in sleep duration, number of awakenings, or time spent awake.⁹

That does not mean your experience of rough nights is imaginary. It likely means parents become more attuned to any disruption when they know a tooth is coming, and normal nighttime waking gets attributed to teething when it might have happened anyway. Another prospective study did find a statistical association between tooth eruption and sleep disturbance using parent-reported diaries.¹⁰ The discrepancy between objective video data and subjective parent reports is telling: the effect on sleep, if it exists, is subtle enough that it does not reliably show up on camera. This is useful information because it means you probably do not need to overhaul your baby’s sleep routine for teething. If sleep falls apart dramatically, look for other explanations like illness or a developmental leap.

The Fever Question

Here is where a stubborn myth deserves a clear correction. Teething does not cause fever. A meta-analysis pooling data from multiple studies found that while teething can lead to a slight rise in body temperature, that rise does not reach the threshold that defines a fever.¹¹ The difference is clinically meaningful. A baby who feels slightly warm to the touch may be teething. A baby with a temperature above 100.4°F (38°C) has something else going on.

This matters because attributing a genuine fever to teething can delay diagnosis of an actual infection. The prospective study that tracked individual tooth emergence found that congestion, cough, fever above 102°F, vomiting, and diarrhea were not significantly associated with teething.⁷ If your baby develops any of these, treat them as signs of illness, not teething.

The Drool Rash and Other Skin Changes

One thing teething does cause is a facial rash, and it is easy to mistake for something more worrying. Constant drool irritates the skin around the mouth, chin, and sometimes the neck and chest. The rash looks like small red bumps or patches of rough, chapped skin. It is simply a contact irritation from saliva sitting on the skin. The same prospective study that ruled out fever and vomiting found that facial rash was statistically associated with teething, while rashes elsewhere on the body were not.⁷ Keeping the area dry with a soft cloth and applying a thin layer of petroleum jelly as a barrier usually prevents or clears it.

Ear-rubbing also appeared as a teething-associated behavior in that same study. Babies tug at the ear on the same side as the erupting tooth because the gums and ears share nerve pathways, so irritation in one area can feel like it is coming from the other. The tricky part is that ear-pulling is also a classic sign of an ear infection, so if it comes with fever or obvious distress, it warrants a closer look from your pediatrician.

When Teething Looks Like Something Else

Because teething symptoms overlap with so many other conditions, it is easy to misattribute something serious to a new tooth. One condition that deserves particular attention is oral herpes simplex virus (HSV) infection. Herpetic gingivostomatitis causes inflamed, swollen, painful gums along with small ulcers inside the mouth, fever, irritability, and drooling, a symptom profile that looks a lot like severe teething. Researchers have specifically recommended that oral HSV infection be included in the differential when parents bring in a baby for “teething difficulty.”¹² The key differences: HSV causes actual ulcers (not just swollen gums), typically comes with true fever, and the baby usually appears much more unwell than a teething infant.

Other conditions commonly confused with teething include ear infections, upper respiratory infections, and the general fussiness that accompanies developmental milestones. A good rule of thumb: teething symptoms are mild, localized, and brief. Anything that looks systemic, like persistent fever, severe diarrhea, or an inconsolable baby, deserves evaluation for illness rather than a shrug and a teething ring.

What Not to Put on Those Sore Gums

The instinct to rub something soothing on your baby’s gums is understandable, but certain popular products carry real risks. Topical benzocaine gels, once widely marketed for teething pain, can cause a dangerous condition called methemoglobinemia, in which the blood’s ability to carry oxygen is compromised. The FDA issued a warning against using any benzocaine-containing product for infant teething, yet a survey of pharmacists found that the majority would still recommend one.¹³ Case reports have documented severe methemoglobinemia from concentrations as low as 7.5%, the strength sold in products like Baby Orajel.¹⁴ A large case series confirmed that these products remain a child-health hazard, with potential consequences including difficulty breathing, seizures, and loss of consciousness.¹⁵

Safe alternatives are simpler. A clean, chilled (not frozen) teething ring or washcloth provides pressure and cold, both of which reduce gum inflammation.⁸ Gently rubbing the gum with a clean finger works too. For babies old enough for solid food, chilled fruit in a mesh feeder can serve double duty. If your baby is truly miserable, a weight-appropriate dose of infant acetaminophen or ibuprofen (for babies over six months) is safer than any topical numbing agent. Check with your pediatrician on dosing, and treat it as a short-term measure for the worst day or two rather than a daily routine.

Babies Born With Teeth

Some babies skip the usual teething timeline entirely and arrive with teeth already in place. Natal teeth are present at birth, and neonatal teeth appear within the first month of life. Natal teeth are roughly three times more common than neonatal ones, and the vast majority, between 90% and 99%, are simply normal primary teeth that erupted early rather than extra ones.¹⁶

In a case-control study of 52 children with these early teeth, all were lower front incisors. Nearly half of the natal teeth were so loosely attached that they needed extraction to prevent the baby from accidentally inhaling or swallowing a loose tooth. About a quarter showed enamel defects, and a small percentage caused ulceration on the underside of the tongue from the baby’s own sucking motions.¹⁷ Related complications include difficulty with breastfeeding and injury to the mother’s nipple.¹⁶ Because most of these teeth are part of the normal set, dentists generally prefer to leave them in place and monitor, only extracting if the tooth is dangerously loose or causing ulceration that interferes with feeding.¹⁸

How Teeth Change Your Baby’s Mouth Beyond the Obvious

There is an aspect of teething that gets almost no attention from parenting resources: the arrival of teeth fundamentally reshapes the microbial community living in your baby’s mouth. Before teeth erupt, the oral environment is all soft tissue, and the bacteria that thrive there reflect that. Teeth introduce hard, non-shedding surfaces that certain species of bacteria can colonize for the first time. Research tracking the oral microbiome in infants found that the eruption of the first two lower incisors shifted the bacterial landscape, altering the relative abundance and diversity of species present.¹⁹ Premature babies showed a different and delayed version of these shifts compared to full-term infants, suggesting that the timing of tooth emergence is a genuine checkpoint in oral ecosystem development.

This is one reason pediatric dentists recommend cleaning teeth from the moment the first one appears, even though it seems absurd to brush a single tiny incisor. That little tooth is not just a chewing tool. It is a new habitat, and the bacteria that colonize it first can influence your child’s cavity risk for years. A soft infant toothbrush or a damp gauze pad wiped over the tooth after feedings is enough to start.

Teething Across the Animal Kingdom

If it is any consolation during a rough teething night, the timing of tooth eruption is a deeply evolved trait tied to the transition from milk to solid food. Across mammals, the emergence of the first permanent molar and the age of weaning are closely linked, reflecting the energy it takes to grow teeth and the ecological pressures that shape when young animals need to start feeding independently.²⁰ Seasonal birth timing even influences tooth eruption in some species, because growing teeth is metabolically expensive and needs to align with periods when food is available. In humans, the connection is less rigid, but the six-month teething window does roughly coincide with the age at which babies begin showing interest in solid food, a developmental overlap that is not a coincidence.

1
Pediatria Polska. Longitudinal study of symptoms associated with teething: Prevalence and mothers’ practices
2
PubMed. Factors affecting the timing of teething in healthy Turkish infants: a prospective cohort study
3
PubMed Central. Infant growth, development and tooth emergence patterns: A longitudinal study from birth to 6 years of age
4
Academia.edu. The Impact of Maternal, Perinatal, and Early Infancy Period on the Eruption Timing of the First Primary Tooth
5
Pediatrics. Signs and Symptoms of Primary Tooth Eruption: A Meta-analysis
6
PubMed Central. Teething disturbances; prevalence of objective manifestations in children under age 4 months to 36 months
7
Pediatrics. Symptoms Associated With Infant Teething: A Prospective Study
8
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9
PubMed. Does Teething Disrupt Infant Sleep? A Longitudinal Auto-Videosomnography Study
10
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11
Pediatrics. Signs and Symptoms of Primary Tooth Eruption: A Meta-analysis – Section: CONCLUSIONS
12
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13
PubMed. What are pharmacists recommending for infant teething treatment?
14
PubMed. Severe methemoglobinemia from topical benzocaine 7.5% (baby orajel) use for teething pain in a toddler
15
PubMed Central. Pediatric Exposures to Topical Benzocaine Preparations Reported to a Statewide Poison Control System
16
Siriraj Medical Journal. Dental Management in Natal and Neonatal Teeth
17
Scientific Reports. Natal and neonatal teeth in newborns and infants: a case-control study
18
British Dental Journal. Natal and neonatal teeth: a review and case series
19
PubMed Central. Microbiota of preterm infant develops over time along with the first teeth eruption
20
PubMed Central. Mammalian Life History: Weaning and Tooth Emergence in a Seasonal World