除了先天遗传因素之外，后天环境也可能间接造成长牙缓慢。就拿早产儿来说，他的长牙时间就必须先扣除早产时间，这样得出的结论才比较准确。如果 是胎龄30周就出生的早产儿，那么长出第一颗牙的时间就必须延后10周(通常是出生后6～8个月时)。另外，凡是出生体重过轻的婴儿，也很可能出现长牙较 慢的问题。
如果孩子的乳牙出现高低不一的情况，则很有可能是牙齿受到过外力撞击，导致与牙齿相连的韧带坏死，而以新生骨头取代(骨沾黏)，从外观看来只是 某颗牙齿生长较慢，实际上却会影响到恒牙的萌发。如果幼儿乳牙提早丧失，牙龈表面便会生成结缔组织，一旦恒牙此时还未充分成长，就会受到压迫而导致恒牙出 牙较慢。另外，有时幼儿所服用的药物会让牙龈增厚，牙齿不易冒出，也会让父母产生长牙较慢的误解。
"Your child grow a few teeth?" After you have children, hard to avoid is often neighbors, relatives and friends asked these questions. Once found signs of slow development of their children, is especially nervous.
Baby yao has arrived in the age of a tooth, why has not the teeth out? Parents can not help but anxious: "development has a www.zshtech.com problem?" "Do you want to calcium?" In fact, the slow growth of the tooth is not always as easy as lack of nutrition, the following four factors are likely associated with tusks too slowly.
The main cause of infant teething slowly from genetic, including family history, ethnic, and so on, even the gender differences. According to most of the research report, the girl's teeth time will earlier than boys.
The acquired environment
In addition to genetic factors, environment also may indirectly cause teething slowly the day after tomorrow. For premature babies, his www.baigoo.net teeth time must deduct preterm delivery time, so the conclusion is accurate. If it's 30 weeks gestational age was born preterm infants, as long as the first tooth will have to delay the time 10 weeks
(usually 6 ~ 8 months after birth). In addition, who was born underweight babies, is also slower teething problems may come up.
Down syndrome, abnormal pituitary gland secretion, ectoderm dysgenesis syndrome, etc., are likely to cause children's teeth speed, must through the blood check to determine the real cause.
Trauma and infection
If the child's teeth has the different situation, is a good chance that the teeth by outside force impact, are connected to the teeth in bone necrosis, and bone instead (bone) (vats) with pleurodesis, from appearance looks like just a tooth grew more slowly, but will affect the germination of permanent teeth. If the children's teeth loss of early, gingival surface will be generated in connective tissue, once grow permanent teeth at this time has not yet fully, will be oppressed and cause permanent teeth teething slowly. In addition, all the medicines sometimes children make thickening of gums, teeth are not easy, also can let parents have tusks slower misunderstanding.
Regular inspection, relaxed state of mind
If parents not a doctor, are often difficult to determine the correct baby teeth, the real reason for the slow as a result, from the child grow the first teeth to before one year old, proposed to dental clinic on a regular basis for inspection, please according to the specific condition of young children to deal with a medical professional, strive to improve teeth as soon as possible.
Needing those who remind everybody is, children's tooth cycle is different, although be in about 6 months long out of the first teeth, but in terms of teeth, the tooth gap within half a
3 year of time is normal, and permanent teeth eruption time reasonable gap and can be extended to one year. So, generally without too much worry, usually just a tooth passage of time, will not affect the function of the teeth.