discoloration in teeth

[mattc]

I am 21 years old and have had great teeth my whole life. I have noticed on my front left tooth and the one beside it further left some super white, not quite lines but close going almost horizontal through my teeth. Is this a sign of my teeth decaying or lack or some vitamin? Its really close to the bottom of the tooth. I have seen it before on others but I dont know why or whats happening to make that happen to my teeth. Thanks Matt

[mattc]

Thank you very much.   Matt

[mike1105]

these are enamel craze lines--- they tend to be more visible in people with very white teeth or teeth that have been artificially whitened. they are nothing to worry about.