Q. My daughter is going six yrs old this Dec. 24, 2009 but one permanent teeth is erupting about 2mm behind the lower incisor. My dentist says that the milk tooth infront of the permanent tooth will just fall-off but 3months passed and still the milk teeth is there. My 34yr old wife has a lower teeth formation which is on top of the other incisors and hopefully my daughter will not follow. Please tell me if I need to let her milk tooth be removed so that the permanent one will have its place. On the other hand, will this removal cause side-effects and what are those? I need your advice.