Very little amount of gel
I've used many different whitening pens and decided to try this product. I liked it better than most because of the thickness of gel.  But after just a week the tip came off, I put it back on but realized it was empty.  I was like..what?...I used it the same as any of the others I have purchased and this ran out much faster.  Likely I bought two so I had a backup but unless the amount of gel in the product changes I will not repurchase.
Rating: 3 stars