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.
Manual Motor Protection is an ideal space-saving and cost-saving solution for single or three-phase manual starter applications. Manual motor starters and protectors are used in commercial and industrial construction, such as woodworking machinery, small machine tools, pumps and compressors.