This is my second purchase from Dr. Collins and I firmly believe it works. I had my teeth professionally whitened 10 years ago, complete with custom trays. My dentist told me that if I used my "splints" after every professional teeth cleaning (3 times a year), my teeth would stay pretty much at their current level. It's true, and for years I've bought my replacement syringes through my dentist. I was hesitant to try another brand but bought Dr. Collins and is happy with the results. I drink coffee and smoke cigarettes, which you would never guess. My routine is: After the professional cleanse, I bleach twice a day for 60 minutes for the next 3-4 days and when I feel I need a boost! Just don't overdo it with bleach in bathrooms, or trust me, your gums are going to hurt terribly. It's trial and error, I'd rather use a few extra days than suffer. Overall I think the product works as advertised and the price is affordable.
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