Depending on the extent of recession, several periodontal techniques should be initialized – be they either a oral cleaning or any dental surgical treatments; in case of mild gum recession, a plaque/tartar control along with gingival massage may soothe the gum recession; often incorporating appropriate brushing techniques & desensitizing toothpaste, especially soft tooth brush would avoid excessive brushing pressures over the tooth root area.
If the gum recession is severe, gum grafting is another option to reinforce the residual tissues; covering the exposed tooth root. If the tooth decay caused due to gum recession is much, then a dental bone grafting is favourable. With tooth recession of more than 1.5mm in deepness, consult your periodontist; most likely a gingival flap surgery would be prescribed to address the gum recession with possibly a permanent healing. Have regular dental check-ups to avoid any further oral infection!