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DEAR ABBY: I'll get right to the point. I have fallen in love with my sister's boyfriend and he with me, so he says. We have been lovers from the first moment we realized our feelings for each other were mutual, and have been hiding them from my sister ever since.

"Greg" is not only handsome, but he listens to whatever I say, takes it into thoughtful consideration and gives me honest feedback. I have tried to let him go and found it quite impossible. He is the most precious thing in my life and he has my whole heart.

Since this has been going on, I have become more and more confused about how I should act, what I should say and do. However, my love for Greg grows. I don't want to hurt my sister, but we were never very close to begin with. Is this relationship worth my pain and great love? -- LITTLE SISTER IN NEW HAMPSHIRE

DEAR LITTLE SISTER: Let's get right to the point. The man you have fallen in love with lacks integrity. He is your sister's boyfriend, and he's juggling both of you. The longer the sneaking around continues, the greater your chances that it will be discovered. And when it is, it will cause a rift in your family and Greg will head for the hills. My advice to you is to end it NOW.

DEAR ABBY: Often, when I have a dental appointment, it will be scheduled in the late morning -- around 10 or 11. I think it would be terrible manners to eat before going, and have the dentist dig through the food in my teeth.

After the actual cleaning and then following the instruction of waiting before the next meal, it could be as late as 1 p.m. in the afternoon before I get my first meal of the day. Some people have good stamina, I suppose, but it is very hard for me to wait that long.

Have you any suggestions about how not to go hungry and yet not be rude to the dentist? -- CLEAN TEETH, RUMBLING TUMMY

DEAR C.T.R.T.: Enjoy a nourishing breakfast and then thoroughly brush and floss your teeth afterward. If you will be eating out, take along one of those little travel brushes and mini-toothpastes that are sold at markets and drugstores everywhere. That way you won't be hungry, and your dentist won't be grossed out.

DEAR ABBY: The letters you have printed recently about cute comments made by children reminded me of something that happened with my son a while back. My child was a preemie who later developed a condition similar to a hernia. It's common in premature babies.

When he was 3 years old, I took him to a pediatric surgeon to have the condition corrected. (This is when the problem began to manifest itself.) My son was given the typical examination by the doctor for a hernia. At 3, my son stood on the examination table, and, as the doctor examined his testicles, he shouted, "I'm going to tell an adult!"

The doctor looked at me as if I should do something. I told my son, "It's OK, Mommy's here, and this is a doctor examining you, but in any other circumstances, you do exactly what you just did!" The doctor didn't say a word, and I gave myself a silent, "Yes! He understands!"

Kids need to know. -- KAREN IN TAMPA, FLA.

DEAR KAREN: I agree. And bravo to you for making sure your son understood that important lesson early.

To receive a collection of Abby's most memorable -- and most frequently requested -- poems and essays, send a business-sized, self-addressed envelope, plus check or money order for $6 (U.S. funds) to: Dear Abby -- Keepers Booklet, P.O. Box 447, Mount Morris, IL 61054-0447. (Postage is included in the price.)

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