text: how can a person whiten there teeth without going to dentist and without using crest whitestrips?   if you mean serious whitening, a dentist or over the counter whitening treatments are the best bet.  whitening toothpastes can help, but won't make big changes.  you can try rinsing with half perioxide, half water twice a day and/or brushing with baking soda with a little water added to make a paste.