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.
What is a PAG? A Planetary Activation Group, or PAG, can be defined as a spiritually committed ally of Mother Earth (Gaia). Its members also support the evolution of human culture to a full galactic one. PAGs are spiritually committed defenders of the Earth's environment (Gaia's physical essence).