Crest whitening emulsions before and after

Before-and-after changes are judged by comparing a recorded shade under consistent lighting. External stains from food or tobacco may respond differently from intrinsic colour within enamel or dentine, and a crown or filling keeps its original shade.

Have teeth and gums examined before using a whitening product. Follow the label or dentist instructions, keep emulsion away from the gingival margin, and stop if burning or significant sensitivity develops.

Seek care for persistent burning, ulceration, severe sensitivity, a single dark tooth, or colour change after trauma. These findings can indicate a condition needing diagnosis.

Ask whether the product contains peroxide, what stain type is present, how shade will be recorded, and whether restorations will need separate colour planning.