I dont think this is only related to database changes.
If you are not the Senior Architect or Database Programmer in your team, any changes you make to design & implementation of code or SQL or DB tables or any other artifacts, should be reviewed and approved by other team members - either peers or seniors.
Are you hesitant to do this? Is there no formal review process already in place?
In your case, it depends on what impact the changes have. Are you making a small change like the length of a single VARCHAR2 column or adding new columns to the table which need buy-in from the front-end developers too?
In any case, I'd say discussion is better than not doing so - and regretting later