Typically, short teeth and a gummy smile do not look better with bleaching because whiter teeth will accentuate the gummy smile. Also, exposed tooth roots don't bleach, so if you have root exposure, your results won't be ideal.
In either of these cases, you may want to consider other cosmetic options. A large body of research on bleaching has determined that low concentrations of peroxide, from a reputable source, are safe if used as directed, after a proper dental examination.
However, tooth sensitivity is a common side effect of bleaching.
Solutions that are more acidic can etch the enamel from the teeth, especially if used for long periods of time, so are to be avoided.
The most common and thoroughly researched bleaching substances are 10% carbamide peroxide (used at home in mouthtrays) and 35% hydrogen peroxide (used in a dentist's office).
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