Slogans are IP assets (trademarks) worth protecting. Registering your trademark gives you at least 15 years of exclusive rights to the use of it, and you can renew it indefinitely as long as it is still being used.
Can a phrase be trademarked?
Federal Trademark Rules These include: Only a phrase that is used for a commercial purpose may be trademarked. You can't trademark a phrase just because you like it and don't want anyone else to use it. You must be using the phrase or intending to use the phrase in connection with the sale of goods or services.
Can you trademark a common phrase?
The answer is yes a catchphrase can be trademarked, but only for the protection of its use in connection with a particular product or services. The mere act of speaking a catchphrase isn't, on its own, an act of commerce, so a trademark wouldn't cover or protect you from someone else just saying your phrase.