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.
For Appendix C.18, The Planetary Protection Research Program, Notices of Intent are now due on June 29, 2012, and Proposals are now due September 5, 2012. This change is being made so that the due dates occur on work days.