How to Use Vowel Exercises to Improve Your Voice

If you're uncomfortable with the nasal quality, then yes, definitely go into doing the vowel exercises. It's just a matter of practicing the pronunciation of the vowels in English that are not nasal. And again, having said that, a nasal voice is not a bad thing to have if this is your natural voice. But it's good to balance between all the resonators, like the chest and the head and the nose.