Why did a Baby tooth crumbles when adult coming in?

Baby teeth, also known as primary or deciduous teeth, are replaced by adult teeth, also called permanent teeth, as part of the natural growth and development of a human's dentition. The process of baby teeth crumbling or shedding to make way for adult teeth is not accidental but rather a carefully regulated biological process. Here are the reasons why baby teeth crumble when adult teeth come in:

1. Root Resorption: As an adult tooth begins to develop beneath a baby tooth, the roots of the baby tooth undergo a process called root resorption. Special cells called osteoclasts break down and dissolve the root material of the baby tooth. This gradual resorption weakens the root structure and causes the tooth to become loose.

2. Loss of Support: As the roots of the baby tooth are resorbed, the support for the tooth diminishes. The tooth becomes less firmly anchored in the jawbone, making it more susceptible to movement and eventual shedding.

3. Pressure from Adult Teeth: As the adult tooth continues to grow and develop beneath the baby tooth, it exerts increasing pressure on the roots of the baby tooth. This pressure further contributes to the weakening of the root structure and loosens the tooth.

4. Natural Shedding: Once the root resorption process is complete, the baby tooth becomes very loose and ready to fall out. The process of shedding is usually not painful and can occur spontaneously or with gentle wiggling.

5. Age-Related Factors: The timing of baby teeth crumbling and adult teeth emerging is closely related to a child's age and developmental stage. While the sequence and timeline may vary among individuals, it generally starts around 6-7 years of age and continues until late adolescence.

It's important to note that the process of baby teeth crumbling and adult teeth coming in is a natural part of human development. However, if you have any concerns about your child's teeth, loose or otherwise, it is always advisable to consult a dentist for proper assessment and advice.