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Teeth Start Forming Before You’re Born — Here’s How That Shapes Your Smile

Most people assume that dental health begins when the first tooth pops through the gums. But the truth is: your oral health journey actually begins in the womb.

Tooth development starts at just 6 weeks of pregnancy

Around the 6th week of fetal development, tiny clusters of cells begin forming the early structure of baby teeth. As the pregnancy continues, these cells organize themselves into the enamel, dentin, and pulp that will eventually become the 20 primary teeth.

By 3–4 months in the womb, the foundation of permanent teeth also begins. Even though these adult teeth won’t erupt for years, the blueprint is already in place before you’re born.

Why this matters

Because tooth formation starts so early, a mother’s health can influence how strong her child’s teeth become.

Some of the factors that impact enamel formation include:

  • maternal nutrition (especially calcium and phosphorus)
  • vitamin D and vitamin A levels
  • illnesses during pregnancy
  • fevers that occur during critical enamel formation stages
  • certain medications

Weaker enamel early in life can mean higher risk for cavities later, even with good brushing.

Baby teeth set the stage for adult teeth

Baby teeth aren’t just “temporary.” They hold space for adult teeth, guide jaw growth, and support healthy speaking and chewing. If baby teeth get cavities or are lost too early, it can affect how adult teeth come in.

That’s why oral health from toddler years and beyond is extremely important.

The big takeaway

Your smile doesn’t start when you brush your teeth for the first time.

Your teeth started developing before you even took your first breath.

Taking care of them early in life supports better oral health through childhood, teenage years, and adulthood.

At Midtown Dental Studio in Toronto, we love educating our patients about how our oral health starts long before we ever hold a toothbrush. Whether you’re preparing for pregnancy, raising little ones, or simply want a healthier smile, we’re here to support your whole dental journey. Book your appointment today and experience friendly, personalized dental care at Yonge & Eglinton.

Properly aligned teeth not only give you a beautiful smile, but they can significantly improve your overall dental health.

(416) 481-7887