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.
Call the toll-free IRS telephone number for individuals if you are calling about a personal tax matter. This number is 1-800-829-1040. The business hours are between 7:00 a.m. and 7:00 p.m. in your local time zone.he IRS can be reached at 1-800-829-4059, between 7:00 a.m. and 7:00 p.m. local time. 6. Call the toll-free telephone number for charitable organizations and government agencies if you are an exempt agency or a retirement plan administrator needing help.