The trademark office can raise issue against your trademark application. There can be various reasons for objection to your application. It may be due to use of the word or logo too much similar to an existing trademark. If approved, it can create the state of confusion.
You will come to know about the objections either after Examination Report has been published online or your lawyer have received it. You should file your response to this objection within a month from it. If you failed to do so, the application can be rejected by the Registrar here itself.
If you submit your response that proves the individuality of your trademark, your applications will most likely be cleared. If you do not submit your response, the application can be rejected by the Registrar here itself.
By the time you face the objections to your trademark application, you will have been using the ™ symbol for quite the time. Your customers would have been familiar with your brand name. If you think of filing a new application, it will waste the resources as well as time. So instead, you can provide response to the objection and clarify the issues by proving your individuality.