Does anyone have great tips on whitening teeth?

Use H2O2. Hydrogen peroxide is the main component of teeth whiting products use full strength to wash your teeth or gargle with it.
Tips. Brush with water only before applying whitening trays or strips (sodium laurel sulfate in some toothpastes can deactivate the gel). To maintain, rinse mouth after staining foods, such as coffee, tea, red wine, soy sauce and use a whitening gel a few times a month to boost to post op shade. Custom trays made by the dentist are always the best at-home way to avoid gel burns on gum tissue.
Use caution. Be smart and disciplined about it gives good result without sensitivity risk.