I've never given my wife a French Kiss and she still married me with out any tongue sugar. 
A french kiss is a great way to arouse her however by stimulating her lips mouth and tongue
But what about bad breath? Bad breath is a big turn off!
Yes halitosis is a real problem when kissing, but sometimes breath mints or brushing your teeth can help with the odor
It's my my breath it's hers. Should I just wait until she come at me with a kissy face and throw a tic tack in her mouth?
Oral hygiene
Oral hygiene is the practice of keeping one's mouth clean and free of disease and other problems (e.g. bad breath) by regular brushing of the teeth (dental hygiene) and cleaning between the teeth. It is important that oral hygiene be carried out on a regular basis to enable prevention of dental disease and bad breath. The most common types of dental disease are tooth decay ("cavities", "dental caries") and gum diseases, including gingivitis, and periodontitis.
General guidelines suggest brushing
free gum increases the remineralization / protection of eroded enamel surface significantly.
Gum chewing is regarded as a helpful way to cure halitosis (bad breath). Chewing gum not only helps to add freshness to breath but can aid in removing food particles and bacteria associated with bad breath from teeth. It does this by stimulating saliva, which essentially washes out the mouth. Chewing sugar-free gum for 20 minutes after a meal helps prevent tooth decay, according to the American Dental Association, because the act of chewing the sugar