Will molars be replaced during the tooth replacement period?

During the tooth-replacement period, some molar teeth (i.e., “槽牙” or “back teeth”) undergo replacement. Deciduous molars in children fall into this category and will be replaced by permanent teeth. However, the first permanent molars—commonly known as “six-year molars”—which typically erupt around age six, are not replaced later in life. Many parents mistakenly identify these permanent molars as deciduous teeth and thus neglect their protection. If a child experiences toothache due to dental caries or recurrent gingival swelling, prompt medical evaluation and treatment are essential.

In children’s oral cavities, deciduous molars serve the critical function of chewing and grinding food; they are classified as replaceable molar teeth and usually exfoliate gradually between ages nine and twelve, while the underlying permanent teeth erupt to complete the transition. In contrast, the “six-year molars” erupt directly around age six without any corresponding deciduous predecessors and are intended for lifelong use. When newly erupted, these teeth exhibit relatively low mineralization, rendering them highly susceptible to caries.

Decay in deciduous molars must not be ignored under the assumption that the tooth will soon be replaced. Untreated caries can progress deeper, potentially damaging the developing permanent tooth germ located beneath the root. Early-stage (superficial) caries can be managed with restorative fillings; however, if caries reaches the pulp, root canal treatment becomes necessary. Once the six-year molars have fully erupted, fissure sealants can be applied to seal deep grooves and pits, thereby preventing food debris accumulation and significantly reducing caries risk—thus preserving the structural integrity of these permanent teeth.

Maintain consistent oral hygiene: brush thoroughly twice daily (morning and night) and use dental floss to clean interdental spaces, especially those between posterior teeth. Limit intake of sugary foods and beverages, and schedule regular dental check-ups to safeguard oral health during the critical transitional phase between deciduous and permanent dentition.