By U.S. Code section 1077, the following types of health care are NOT provided for dependents:
In general, your condition must be "medically significant", i.e. not purely for cosmetic or personal reasons. In some cases, you may be required to prove your need for care by a doctor's/dentist's/physicians recommendation.
Under U.S. Code 1079: "Any service or supply which is not medically or psychologically necessary to prevent, diagnose, or treat a mental or physical illness, injury, or bodily malfunction as assessed or diagnosed by a physician, dentist, clinical psychologist, certified marriage and family therapist, optometrist, podiatrist, certified nurse-midwife, certified nurse practitioner, or certified clinical social worker, as appropriate, may not be provided..."
Plan would impact retiree's benefits