Disadvantages of In-Office Whitening. 1  In-office bleaching is more expensive than take-home alternatives. 2  Its cost, on average, is $650, compared to $400 for take-home trays and under $100 for over-the-counter bleaching trays or whitening strips.
Planetary protection is a guiding principle in the design of an interplanetary mission, aiming to prevent biological contamination of both the target celestial body and the Earth in the case of sample-return missions.
FALL PROTECTION â  Rebar and Concrete Formwork. Introduction. Fall protection is a concept that describes behaviors, systems, processes, procedures, equipment, and rules intended to protect workers from fall. hazards. Fall protection doesnât mean bulky or cumbersome equipment. It. doesnât interfere with work tasks and it doesnât get in the way of coworkers. if you understand the concept and apply it appropriately. Thatâs the pur-. pose of this manual: to help you use appropriate fall protection for rebar. and concrete formwork. OR-OSHAâs fall protection requirements. for construction work: 1926 Subdivision M. OR-OSHAâs fall protection requirements for the construction industry are.