--------------------
My six year old son had to have his top four teeth pulled out when he was two because of cavities.He had a partial to keep his teeth from shifting and we have had to have this put back in several times.Some children just get the short end of the stick when it comes to the teeth which is caused by hereditary genes.If you do not have the caps put on he will end up with a major cavity causing the tooth to need to be removed and a partial put in.In fact my now 3 year old had two silver caps on his top front teeth.
Source
10 Ways to Overcome Difficult Sleep (suitable for experienced frequent insomnia)