To understand how a zipper operates, first look at its foundation, called tape. This is the portion sewn into other material to secure the zipper in place. On top of the tape are the teeth ...

In dentistry, a crown is a cap or covering fitted over part of a tooth that’s damaged from: breakage tooth decay a root canal a large ... teeth, many crown options are available. Gold and ...

From the bathroom to the bedroom, the zipper — celebrating the 100th ... Unfortunately, his invention had large teeth that could be tricky to close, and it also tended to come open by itself.

AL SMITH, New York’s governor in the 1920s, had teeth “capped with gold,” according to Robert Caro’s “The Power Broker.” Dr. Ruchi Sahota, a dentist in Fremont, Calif., explained that ...