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.
This type of LPS protects the building from damage by direct strike lightning but doesnât prevent the lightning striking the building. This type of LPS can be divided into:-. 1  Conventional lightning protection system,  Non-Conventional lightning protection system.