The Complete Dentist's Guide to Teething: From First Tooth to Full Set

By Dr Jack Brazel BChD · Reviewed by Dr John Krezel, Specialist Prosthodontist

Teething is one of the first big milestones you will navigate as a parent. It can feel overwhelming, partly because the advice out there is contradictory, much of it is outdated, and very little of it comes from people who actually work with teeth for a living.

We are Jack and John, two practising UK dentists and the co-founders of MamaSmiles. This guide brings together everything we know about teething from clinical practice, dental science, and our own experience as parents. It is designed to be the one resource you come back to throughout the teething journey, from the first signs of gum activity to the last molar coming through.

When do babies start teething?

Most babies begin teething between 4 and 7 months, with the lower central incisors (bottom front teeth) usually appearing first. But there is a wide range of normal. Some babies show early signs from 3 months. Others do not get their first tooth until close to their first birthday. Neither extreme is a cause for concern.

The full set of 20 primary teeth typically completes by age 2.5 to 3 years. The process is not continuous; it comes in waves, with periods of activity followed by quiet stretches. For a detailed breakdown of what happens when, see our guide to how long teething lasts and what to expect at each stage.

What are the normal signs of teething?

The signs that are genuinely associated with teething are relatively mild and localised to the mouth. They include increased drooling, chewing on hands and objects, slightly swollen or reddened gums where a tooth is emerging, mild fussiness in short bursts, and minor sleep disruption around the time a tooth breaks through.

Many symptoms commonly attributed to teething, including fever, diarrhoea, and rashes, are not reliably linked to tooth eruption. The timing often overlaps because teething begins around the same age babies start putting everything in their mouths and being introduced to new foods. Knowing the difference between teething signs and illness symptoms matters. We cover this in detail in is it teething or something else? and normal teething symptoms explained.

Why teething is about more than just comfort

Most teething advice focuses entirely on getting through the discomfort. That is understandable, but it misses the bigger picture. Teething is the moment your baby's enamel is first exposed to the oral environment, and newly erupted enamel is thinner and less mineralised than adult enamel. It is more vulnerable to acid attack and early decay from day one.

This means the teething period is not just a comfort challenge. It is the first window of opportunity for dental care. What you put on your baby's gums and teeth during this stage can support enamel development, and what you do not can leave emerging teeth unprotected.

This is why we formulated MamaSmiles Teething Gel with hydroxyapatite, the mineral teeth are naturally made from, alongside botanicals like aloe vera, chamomile, and curcumin. The goal is a product that offers gentle daily care while also protecting emerging enamel. For a deeper look at how hydroxyapatite works and why it is safe for babies, see our article on whether hydroxyapatite is safe for babies.

What dentists recommend during teething

The approach we recommend in clinic is a combination of physical comfort, good oral care habits, and products chosen for their ingredients rather than their brand name.

Gentle gum massage. Using a clean finger to apply light pressure on the gums where teething is occurring is one of the most effective responses. The counter-pressure works against the upward push of the erupting tooth. When combined with a teething gel, the massage also delivers ingredients directly to the gum tissue and tooth surface.

Cool teething rings. Chilled (never frozen) teething rings give your baby control over where and how they apply pressure. Solid silicone rings are the most practical everyday option. For a full comparison of teething ring types, materials, and safety considerations, see our guide to teething gels vs granules vs teething rings.

Ingredient-led products over numbing agents. The professional consensus has moved away from benzocaine and lidocaine-based teething gels. These numb temporarily but carry safety considerations and offer no benefit to developing teeth. We explain the evidence behind this shift in why dentists recommend benzocaine-free teething gel.

Starting a brushing routine early. As soon as the first tooth appears, start brushing with a soft baby toothbrush and a smear of baby-appropriate toothpaste. Before teeth arrive, wiping gums with a damp cloth builds the habit. Our guide to brushing your baby's first teeth covers the practical how-to.

Understanding teething products: what is actually in them

The teething product aisle can be confusing. Gels, powders, granules, rings, necklaces, and homeopathic preparations all compete for your attention. The differences between them are much bigger than the packaging suggests.

We have written detailed guides on the major product categories to help you compare:

Teething gel ingredients. Not all gels are the same. Some contain numbing agents, others use botanical and mineral-based formulations. Understanding what is in the tube matters more than the name on the front. See teething gel ingredients explained.

Teething powders and granules. Popular UK teething powders use homeopathic preparations of chamomile. We examine the evidence base, how the delivery format compares to gels, and why convenience and effectiveness are separate questions. See do teething powders work?

Amber teething necklaces. Despite their popularity, there is no scientific evidence that amber necklaces provide any benefit, and they carry documented safety risks. We cover the claimed mechanism, why it does not hold up, and what the NHS and other bodies say. See amber teething necklaces: do they work?

Choosing the right remedy. If you want a single overview comparing all teething product types, see our guide to how to choose a teething remedy and the truth about teething remedies.

Teething care by age

What is appropriate for your baby changes as they grow. A 3-month-old showing early teething signs needs different support from a 12-month-old cutting molars.

At 3 to 6 months, the focus is on gentle gum care, building familiarity with mouth routines, and introducing a teething gel when the product's age guidance allows. See how to start a baby oral care routine at 3 to 6 months.

From 6 months onward, teeth start appearing and the routine expands: brushing, gel with gum massage, teething rings, and cool foods once weaning begins. By 12 months, the habits you have established matter more than any individual product.

For a complete age-by-age breakdown of what to use and when, see what can I give my baby for teething, by age.

Preventing early tooth decay

Baby teeth are more vulnerable to decay than most parents realise. Their enamel is thinner, the diet often includes frequent milk or juice exposure, and oral care habits are still being established. Decay in baby teeth is not trivial; it can cause infection, affect the permanent teeth developing beneath, and lead to extractions that create spacing problems for adult teeth.

Prevention starts with three things: brushing as soon as the first tooth appears, avoiding prolonged exposure to sugary drinks (including milk left on teeth overnight), and choosing oral care products that support enamel rather than just masking the teething experience.

Products containing hydroxyapatite and xylitol actively support enamel and oral health. Products containing sugar do the opposite. Always check the ingredient list.

When to see a dentist

The NHS recommends taking your baby for their first dental visit when the first tooth appears, or by their first birthday, whichever comes first. NHS dental care is free for all children under 18.

An early visit is not about treatment. It is about getting your baby comfortable in the dental environment, letting the dentist check development is on track, and giving you the chance to ask questions about oral care, diet, and teething. We cover what to expect in detail in baby's first visit to the dentist.

If your child is older and you are thinking about alignment or bite issues, our article on when to see an orthodontist covers the early warning signs and timing.

Teething tips from dentist parents

Some of the most practical advice does not come from textbooks; it comes from experience. Dr Rami Youssif shares his personal top five in teething tips from a dentist dad.

For a broader overview of the teething journey from a parent's perspective, including what to expect night by night, see surviving the teething journey.

About MamaSmiles

MamaSmiles was founded by Dr Jack Brazel (BChD) and Dr John Krezel (Specialist Prosthodontist), two practising UK dentists who saw a gap between what was available in the teething aisle and what they would actually recommend to their patients' families.

MamaSmiles Teething Gel is the world's first dentist-formulated hydroxyapatite teething gel. It combines hydroxyapatite, aloe vera, chamomile, curcumin, and xylitol in a berry-flavoured gel designed for daily use from the earliest stages of teething. It is free from benzocaine, lidocaine, fluoride, SLS, sugar, and artificial colours. Made in the UK.

We also make a pregnancy toothpaste and pregnancy mouthwash designed for the specific oral health challenges of pregnancy. For more on how pregnancy affects your mouth, see our pregnancy oral care guides on hormonal changes and your mouth, oral health tips during pregnancy, and seeing your dentist during pregnancy.