There are two types of "In-Office Teeth Whitening", Dental and Non-Dental:
Dental In-Office Teeth Whitening-
Dentist have the capacity to perform teeth whitening treatments using very strong gel; thus requiring a ginival barrier to protect the gums. ZOOM Whitening (product by Philips Oral Care) is one of the best however, many competitors are moving into this arena so most dentist have a list of product vendors to choose from which sell these high power gels. The procedure still varies from dentist to dentist. Now that its in the clear that dental "high strength" teeth whitening is the best, the next
question is, how many dentist use strong gel? We inquired on a random 30 dentists and found that only 3 dentists used high strength gels, the others used a lower strength gel than lots of non-dental establishment, i.e. salons, spas, tanning salons, etc... We asked several of the dentists why they used a lower strength gel than what they were capable of using. Some said it was due to sensitivity, others said they got the same results with lower strength, some dental practices had several different strengths, home kits, and teeth whitening accessories. So with this in mind, be sure you ask your dentist what system they use due to dental teeth whitening costs are significantly higher than non-dental treatments, ranging from $400 to $1200 each.
Non-Dental In-Office Teeth Whitening-

There are many different teeth whitening procedures available and the results vary significantly. Some procedures use gel combined with an accelerator light, some use carbamide peroxide gels, other procedures call for hydrogen peroxide gel; these all effect the results. So the question is, which procedure deems itself most effective? I conducted research on various types of gels, lights, complaints, reviews, tests, etc.. to find the most dominate product / procedure combination; I then created a detailed quality manual based off this information. These procedures are currently practiced by Lazer Bright in Eugene, Oregon. Lazer Bright is a new in-office laser teeth whitening company in Willamette Valley Oregon which undergoes internal audits to ensure a quality service remains consistent within the company.