Hi, about 6 month's ago I fell and chipped both of my front teeth. I had them bonded about 2 days later and everything was fine. About a month ago I noticed a Rough circle shaped spot on my tooth and what look like crack lines coming from the spot. The lines only come out of this one spot. I cannot feel the lines with my tongue or my finger and I cannot see them unless I shine a flashlight or something directly on my tooth. I haven't noticed any unusual sensitivity to hot or cold. I've seen my dentist since discovering these cracks but did not mention them to him (I just forgot) but he also did not mention that anything was wrong with this tooth. Should I be worried about these crack lines?