Although cases like Katzenbach and Heart of Atlanta Motel stretched Congress' power to regulate under the Commerce Clause, United States v. Lopez, 514 U.S. 549 (1995) restricted the Commerce Clause's reach.
Toothbrushes have been around for hundreds of years. In fact, the first known toothbrushes were used about 5,000 years ago and were made of twigs. The Prophet Mohammed introâ¦duced the use of the miswak (toothbrush) to the middle east about 1,300 years ago.
How often should you change your toothbrush. Some people can use their toothbrush repeatedly until they misplace it. The average American only change their brushes 1.9 times a year. The American Dental Association recommends that you change your toothbrush at least four times a year, approximately 3 months and every time you are sick. If the bristles of your toothbrush start flaring before three to four months, then you are using too much pressure to brush your teeth. Dentist believes toothbrushes should be thrown out after roughly 40 to 50 uses. Healthy people should change brushes every two weeks.