The older the lady the more risk of prolonged DATY

The major worry is human papilloma virus which causes throat cancer in men (particularly if you are a heavy smoker or heavy drinker) and causes cervical cancer in women

Less worry if you don't have most of the risk factors for throat cancer - smoker, heavy drinker (more than 2-3 drinks per day), infrequent dental checkups, bad gum disease. Even Asian race is a risk factor for men. Can give you the evidence as a link if you need

The problem is so well known that the Australian government pays millions for all school aged students to be vaccinated against this virus. Unfortunately older women already finished school, and overseas women, don't get the protection

A few famous people acknowledge that they contracted throat cancer from the combination of smoking, drinking and DATY

My advice, take or leave it, regarding punting, not girls you meet socially:
Keep DATY to a minimum with any WL older than 25, or a busy sex worker
Avoid prolonged DATY entirely with older WL especially those who may allow BBFS

No research done to test if mouth wash really helps.
Keeping DATY brief with WLs and washing mouth out with mouth wash asap is the best policy

Throat cancer and cervical cancer (related conditions) are not rare diseases. Ask any lady. Regular formal checks (pap smears) ARE recommended for all women