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.
Toothbrushes Key Points. The consensus recommendation is for people to brush their teeth for two minutes twice a day with a toothbrush that has soft bristles. Replace toothbrushes every three to four months or more often if the bristles are visibly matted or frayed. Either manual or powered toothbrushes can be used effectively.