About Aphthous Ulcer: These small sensitive painful craters in the mouth are common canker sores. There are many possible causes of apthous ulcers and frequently the cause is unknown. See also: sub-topics
The IRS phone number for individuals is (800) 829-1040. Businesses can call (800) 829-4933. Hearing impaired individuals can contact the IRS using TDD at (800) 829-4059. Operating hours are between 7 a.m. and 10 p.m. in your local time zone. After hours, a recording will direct you. Have all your paperwork in front of you when you call.
IRS Offers Saturday Phone Hours. WASHINGTON - The Internal Revenue Service tax help lines -- already available weekdays from 7:30 a.m. to 5:30 p.m. -- will be open from 10:00 a.m. to 2:00 p.m. on the next three Saturdays, the final weekends before the April 15 filing deadline. But the toll-free number -- 1-800-829-1040 -- is not the only way to get IRS help. The IRS Web site -- www.irs.ustreas.gov -- has an assortment of tax information for both individuals and businesses. It has had over 60 million hits this filing season.