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.
Radiation Protection is a general term applied to the profession / science related to protecting man and the environment from Radiation hazards. Strictly speaking it should represent all forms of radiation (e.g. Ionising and Non-Ionising) but is mostly applied to ionising radiations.