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.
Triflex ProTect is a fully reinforced waterproofing system with a polymethyl methacrylate (PMMA) base with material properties which offer top performance. This means it can be used for roof waterproofing and a host of other aplications.