some genetically blessed people are born with the complete potential for a brilliant smile. they have the right genes for perfect teeth. but others don’t. these are the ones who may need help from a dentist. the treatment to obtain a brilliant smile may take up to four years. that is to say, one might need to wear braces for two years and then a retainer for two years to keep their teeth in place. for one to acquire that brilliant smile, many procedures are involved, and the patient’s cooperation is essential.

여기서 빨간색으로 표시된 one(s)가 의미하는게 뭔지 알려주세요~