By this point, it’s pretty clear that people want white teeth. As a country, we spend $1.4 billion on consumer teeth whitening products, and the teeth whitening industry generates over $11 billion a year in revenue. We’re not complaining that people are willing to pay to have white teeth, but it does beg the question—what’s staining our teeth in the first place?

Foods and drinks cause staining in a couple ways. Foods that are high in acid tend to strip away enamel, which exposes the more vulnerable dentin to staining. Many foods—typically ones with natural bright or rich colors—contain chromogens, substances that adhere to tooth enamel and stain it.

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Do you ever stand in the oral care section at a store—maybe your local supermarket, maybe a general retailer or a pharmacy—and wonder why there are so many different types of toothpaste? Think about how many brands there are—and then how many different types of toothpaste there are for each brand! Crest 3DWhite, Pro-Health, Pro-Health Advanced, with Scope, Sensi, regular old Crest, Kids’ Crest… the list goes on and on.

A helpful way to think about your toothpaste choice is to think about your goals, beyond basic hygiene, when you brush. Do you want fresh breath or whiter teeth? Do your teeth hurt when you brush? Do you want to avoid a long cleaning next time you’re at the dentist? When you answer those questions, you’ll start to narrow down that overwhelming selection of toothpastes to a more manageable few.

There are a few basic types of toothpastes out there today. However, it’s important to realize that many toothpastes fit into one or more of the categories. (This is why there are more than 40 different types of Crest alone, after all.)

Fluoride Toothpaste

Fluoride toothpastes contain fluoride compounds to help prevent tooth decay. Fluoride works by strengthening, and even helping repair, tooth enamel. These toothpastes vary in the amount and type of fluoride compounds they contain and can come in a variety of flavors that appeal to both adults and children.

Whitening Toothpaste

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