How many molds of my teeth would the ortodontist get before i receive braces?

Generally one set: Most of the times one set of upper and lower molds or impressions are required. He can either duplicate or take more if special circumstances arise. With clear aligners like invisalign or clear correct , this process might have to be repeated more often during the treatment

Usually 2: Usually one of the upper and one of the lower jaw/teeth.

Varies: Usually impressions are taken to produce one pair of study models to assist in diagnosis of your situation. There may occasions were other types of impressions and models may be required such as to make different appliances to go along with braces like palate expanders, space holding devices, etc.