Short-term no crescent on the thumb is a normal phenomenon, long-term no crescent may be the lack of trace elements or endocrine disorders.
1. Lack of trace elements: the lack of trace elements in the body will be manifested in the nail missing meniscus, you can eat more fresh fruits and vegetables, can give the body to replenish the required trace elements.
2. Endocrine disorders: endocrine disorders may also show the symptoms of missing meniscus, you need to rest on time, to avoid overwork, to carry out appropriate physical exercise, promote blood circulation, enhance the body’s immunity.
In addition to the above two reasons, as the human body ages, the crescent teeth will also become less and less. If there is any discomfort, you should consult a doctor in time.