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.
Earth's Magnetosphere is Planetary Logos. As humans living on this planet, we are inseparable to every single event recorded as it transpires in the timeline histories of this planet, equal in all of its beauty, magnificence and in its brutal events of horrific trauma.