In the first phase, 50% of the subjects will be randomly assigned to use either conventional flossing technique, while the other 50% will be assigned to use the knotted floss technique. Only the first author know about which subject will be assigned to which technique. The treatment phase will consist of 6 weeks of daily use of the assigned technique followed by a 'washout period' of 14 days, following which will start the second treatment phase wherein the subject will use the other flossing technique. i.e those using the conventional flossing technique will now use the knotted flossing technique and vice versa. At the baseline appointment for each phase, every subject will be given their assigned floss products. Subjects that will be assigned to conventional flossing will receive ninety pieces of waxed floss, fifteen centimeters in length each piece, (Reach¬® by Johnson & Johnson Inc.) equally divided in three ziplock® bags. Subjects that will be assigned to knotted flossing technique will receive the same except that every floss thread will have a simple knot at around the middle. Each subject also will receive a sample of Colgate® Soft Toothbrush and Dentifrice (Colgate® Inc). The registered subjects will be instructed to brush their teeth twice a day in their customary manner using the above toothbrush and dentifrice provided and cautioned not to use any other oral hygiene aid except for the assigned floss twice a day. They will be instructed to wrap the floss around their middle or index finger and gently slide the floss between the teeth and move it along the gum margin, curved into "c" shape. After this, they will have to move the floss up and down several times between each tooth without using excessive pressure, finally allowing it out through embrasure. The subjects will have to return to the third author any unused floss products at the end of the phase. During the 'washout period' the subjects will be instructed to perform normal oral hygiene practices of tooth-brushing with dentifrice and refrain from using any floss or any additional plaque control aids. The "washout" period is designed so as to give subjects time to return to their original oral status and establish parity in baseline clinical measurements prior to starting the second treatment phase. Such a 'washout' in study design allowed use of 50% lesser subjects.