Here are corrected and natural-sounding versions of that sentence. I’ve avoided making a guaranteed medical promise and kept it safe and clear:
- Grammatically corrected:
Put two drops in your ear, and you will hear like before. - More natural English:
Put two drops in your ear, and your hearing should improve. - Instruction-style:
Apply two drops to the ear to help restore hearing.
If you want it to sound more professional, more casual, or like an advertisement, let me know and I’ll tailor it.