This look can be improved by correcting the gingival coverage. We often see young patients with gums that cover the teeth making them appear smaller than normal. Lasers are perfect to do this quickly, painlessly and have the benefit of rapid healing.
I'll first mention that sometimes patients mistake a hygienist for a docotr, a doctor for a dental assistant or a dental assistant from a hygienist.
A hygienist should not adjust crowns unless they have specific credentials/license (rare). They are not trained to adjust teeth but some...
A trained and experienced cosmetic dentist will be able to reshape the temporaries to your satisfaction and then take an impression of the desired shape to send to the lab for duplication (ideally a digital scan, like iTero, is done and emailed to the lab so they can duplicate without risk of ...