For Dr. Val Kolpakov, a dentist from Saginaw, Michigan, dentistry is more than just a profession, it’s a hobby. He managed to put together the largest collection of toothpastes in the world, just for fun. A new Guinness Book category has been approved, specifically for Doctor Kolpakov, and now all he need do is submit proof that he has the world’s largest collection of toothpastes.