The first thing to do when kissing a new lover is to find out with your lips and tongue where his or her teeth are, so you can avoid banging into them with your own teeth. Clashing teeth is as impersonal as clashing spectacle frames. Vary the pace, and vary the initiative, sometimes taking it, sometimes being receptive to your partner. Non-smokers do not like the taste or smell of tobacco. Until you have got to know someone well and they have assured you they don't mind it, don't eat strong tasting food, such as garlic or curry, unless your lover is eating it too.
Oral hygiene is important.
Make sure your mouth looks and tastes good. Get your dentist to de-scale your teeth regularly and eat a healthy diet so that your breath is fresh. Don't kiss or have oral sex if you have a mouth or throat infection. Kissing can transfer an estimated 250 different bacteria and viruses carried in saliva, though as yet there is no evidence to suggest that AIDS can be caught in this way. Being kissed passionately by a man with a stubble chin is not anywhere near as erotic as being kissed passionately by a man who has recently shaved.