Yes, you can smell breath while kissing.
Kissing involves close proximity, making you highly susceptible to smelling your partner's breath. While a pleasant-smelling breath can enhance the experience, bad breath can certainly be noticeable and detract from it.
According to Dr. Adrian Kat, a leading Perth dentist, kissing can transfer approximately 80 million bacteria. This fact highlights the intimate exchange occurring during a kiss, which also includes the exchange of breath. Therefore, if someone has poor oral hygiene, you are likely to notice it. Kissing someone with poor oral hygiene can lead to more than a whiff of bad breath.