Hyphenation is enabled on Tilda by default. If the word is too long, the built-in script makes sure the word is properly hyphenated.
If the words are hyphenated incorrectly, copy the block and set it up specifically for mobile view. Set the title size to 22px or less for < 480px visibility range, for example. You can also add a soft hyphen (#shy) to enable hyphenation without forcing a line break.
Read our guide to adjusting your website for mobile view: http://help.tilda.ws/mobile-version