Teeth Whitening is really an amazing aspect of our cosmetic practice because it allows us to get a dramatic cosmetic result in a very non invasive way. So you can really change a person's smile quickly, maybe not make it perfect, but just dramatically increase the level of their of their whiteness. Their dramatically improve their smile and make them much happier with their appearance without doing any major dentistry. We really respect and value what the over the counter products can do to them. Some are very effective and very cost effective and a really good place for a patient to start, if they are not sure if they really want to do it if they're not a candidate for it, because those products will work to a certain level, and they will work without some of the minus side effects that can happen with the in office whitening, such as the minor discomfort, and they're a good place for them to begin, but they're not as effective as the in office whitening materials and process that we use. We will do a custom fitted tray that is made to adapt, you know tightly to the patient's mouth and teeth in a way that will help the efficacy of the whitening materials so they'll get a much faster and wider response. Some people were really dark teeth need a stronger material that we now have available to our patients that can really whiten very dark teeth, but they need a special tray made for them and they need to be monitored and managed in a way that we make sure that you know they're comfortable, and it's effective and you just can't get that in over the counter products so the in office whitening comes with our attention and our care and the assurance that now this will work very well for them.