<s>[INST] My daughter is almost 7 years old. She recently got her front permanent lower tooth and i could see a small yellow mark on it. what could be the possible cause? She never had any trauma with her milk tooth  only thing was that this permanent tooth was growing behind the milk tooth. [/INST] this may be caused due to delayed shedding of the milk teeth.small yellow spot can be due to improper brushing of the teeth due to the presence of milk teeth.if the defect lies in enamel den it can be an early caries lesion that can be restored by a dentist </s>