The hypothesis of this study is that using "Bio Mineral" toothpaste for 4 weeks will decrease plaque and gingivitis of mild periodontitis patients compared to patients using "Perio Total Care" toothpaste.

This study is Single blind, Randomized, Active-controlled Comparative clinical trial to evaluate clinical efficacy and safety following the application for 4 weeks of Bio Mineral toothpaste in patients with mild periodontitis.

This study is Single blind, Randomized, Active-controlled Comparative clinical trial to evaluate clinical efficacy and safety following the application for 4 weeks of Bio Mineral toothpaste in patients with mild periodontitis. 30 patients of treatment group and 30 patients of control group, total 60 patients will be enrolled to this study. Every patients will use investigational toothpaste 2 times everyday for 4 weeks and brush their teeth at least 3 minutes each time with 1ml of toothpaste.

Inclusion Criteria:

1. A healthy man or menopausal woman who is at least 18 to maximum 63 years of age.
2. Agreed to participate voluntarily in the study.
3. Must have over 20 maxillary teeth
4. Must have mild periodontal disease which can induce mild plaque.
5. Having no general disease except for dental disease.
6. Must be able to understand and carry out the trial's objective and method.

Exclusion Criteria:

1. Who has history of using antimicrobials or antibiotics during the past 30 days.
2. Who has history of periodontal treatment during the past 30 days.
3. Who has acute pain or severe suppuration caused by pericoronitis of the wisdom tooth.
4. Who has hypersensitive conditions caused by Gingivitis or periodontitis.
5. Who having restorative dentistry or wearing braces widely.
6. Who using tobacco products (Except for who quit smoking)
7. Who has been participated in other clinical trials during the past 4 weeks.
8. Who judged inappropriate to participate in the study by investigator