You may want to consider bleaching and doing a touch up bleaching every so often (like once a month or so) to maintain the whiteness. Also, you may want to look at buying an interproximal brush or rubber tip to try to clean between your teeth. You can also look into some whitening toothpaste.
Hi, Stains are a common problem among many individuals even without deteroiating habits. This happens because of chromogenic bacterias in the oral cavity which tend to produce such recurrent external stains commonly brown in color but also green and orange stains could be seen in some people. You can blame it on them. Only options to prevent is 1. use mouthwash regularly to to control their population 2. interproximal brushes or floss and proper technic of tooth brushing. Once stains become visible then you have to seek dentist's help to them removed.
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