Sometimes orthodontists need to remove some bicuspid teeth in order to either align the front teeth, move the front teeth backwards, or both. The amount of change in the profile can be beneficial in many cases. But it can also be detrimental if done on the wrong kind of case. How much retraction happens depends on several factors including how much crowding or overlapping is present, the patient's desire for a profile change, and the doctor's skill and mechanics used. A skilled doctor can often control how much retraction happens in order to give you a pleasing lip profile.
Although this type of treatment is sometimes necessary or at least highly recommended, it should not be taken lighthly. A thorough diagnosis by an expeirenced orthodontist is essential. This includes making of photographs, at least two x-rays, and models of your teeth. This is standard of care for a proper treatment plan.
Again, check out the linked video. Good luck!