My dentist recommends i whiten my teeth before getting a crown. will the new shade be easy to maintain so color of teeth & crown stay uniform?

Relatively easy: Brushing and flossing well, keeping regular dental hygiene appointments, and avoiding foods that stain teeth will all help, but lets face it, over time they will stain again regardless. Take home touch up kits are available to maintain the white color.

Great question: If the crown is pfm (porcelian fused to metal) it will stay uniform. If the crown is all porcelian it may tone down a bit over time. Bleach is not a permanent fix. It will whiten your teeth and may require touch ups. Touch ups vary per patient. If the crown is on a molar it shouldn't be a huge aesthetic issue. On a front tooth... I would have to assess the patient, impossible to do in this forum.

Yes: First, it's always best to ask your treating dentist who has actually seen you ; knows your specific circumstances the best. In general, the crown will not change color over time, ; your teeth will basically remain the same shade, although it might darken slightly over time with aging. What your dentist suggested seems reasonable ; i would go with his\her recommendation. Both can stain on surface.