Periodontal measures improved in the treatment group compared with the control group at @ months , with adjusted between-group differences of @ mm ( @ % CI , @ to @ ) for probing depth , @ mm ( @ % CI , @ to @ ) for clinical attachment loss , @ % ( @ % CI , @ % to @ % ) for bleeding on probing , and @ ( @ % CI , @ to @ ) for gingival index ( P < @ for all ) .