In brief
word-break controls opportunities for line breaks in text. break-all can split words between characters to prevent overflow.
Useful to know
word-break controls opportunities for line breaks in text. break-all can split words between characters to prevent overflow. [1]
This is not a cost-free fix for every long heading. Excessive splitting makes Bulgarian and English words harder to read. Consider the available width and content's purpose before applying it across the whole site.
Sources
For further detail and to check the information: