Dear lybrate-user,
bad breath from the mouth can be of various reasons, like accumulation of plaque and tartar, decay in teeth, dry mouth, smoking and tobacco chewing, consumption of caffeinated beverages and alcoholic drinks, sore throat, bad digestion.
For beginning, go for scaling and polishing of teeth. Use a mouthwash after brushing twice daily. Increase intake of water, and clean tongue regularly. No medicines help in case of bad breath, unless there is a digestive problem. I suggest that you consult me privately on lybrate so that I can prescribe the appropriate mouthwash and gum paints to you.