There has been a “huge” increase in folks over 50 getting their teeth straightened, says orthodontist Howard Fine, DMD (91 Smith Ave, Mount Kisco 914-215-5521; 190 Bedford Professional Building, Katonah 914-228-1007; fineorthodontics.com), a fact he attributes to the grow- ing popularity of the Invisalign system, which uses clear plastic aligners that can be removed for eating and dental care. Metal braces are still necessary in some cases, but can be fitted inside the teeth so they are less obtrusive.