The best way to trim the toenails of an older adult at home is to trim them straight across, if possible. Rounding the edges encourages ingrown toenails. If the nails
are thick, try soaking the feet in warm water prior to trimming.
A toenail clipper with a straight edge works well. Use an emery board to smooth rough edges.
If the nails prove difficult to trim or if the person has diabetes or vascular disease (which warrant regular inspection of feet because they're especially prone to infection and damage), the person should be seen and cared for every two or three months by a podiatrist or other physician.