Complex sentence: In one small study, sesame oil was found to be effective at reducing plaque and oral bacterial load, but was less effective than chlorhexidine (a chemical antiseptic mouthwash), otherwise the health claims of oil pulling have failed scientific verification or have not been investigated.
Split into simpler sentences: In one small study, sesame oil was found to be effective at reducing plaque and oral bacterial load, but was less effective than chlorhexidine (a chemical antiseptic mouthwash). In other respects, the health claims of oil pulling have failed scientific verification or have not been investigated.